Genetics and Developmental Biology

hellpp please on exam samples .. variation genetics

hellpp please on exam samples .. variation genetics

1. Why is genetic variation important in evolution?

2. How does inbreeding increase the strength of genetic drift within families in large populations, and how can this effect be empirically detected?

3. The graph below was prod

gh1991   1138   2 Replies

bio_man

A correct statement is:

A correct statement is:

The correct statement is:   
         A) The ectoderm gives rise to the liver.
    B) The mesoderm gives rise to the notochord.
    C) The endoderm gives rise to the hair follicles.
    D) The mesoder

pmiller8892   2669   3 Replies

patel202

please help: hardy weinberg and things.. :)

please help: hardy weinberg and things.. :)

1. One factor that can make the effective population size (Ne) differ from the number of breeding individuals is the breeding sex ratio. What is the value of Ne for a population of 5 breeding adult males and 95 adult females? Explain why Ne is differ

gh1991   1507   1 Reply

bio_man

What is the number of deaths due to sickle-cell anemia in a region without mosquitoes expected to be

What is the number of deaths due to sickle-cell anemia in a region without mosquitoes expected to be

Q1. What are alleles?
a)Different forms of the same gene.
b)Different genes.
c)The different characteristics of an organism.
d)Genes found only in humans.

Q2. If you add up the frequency of homozygotes + the frequency o

gh1991   12689   2 Replies

duddy

Human Reproduction and Development

Human Reproduction and Development

1. The thickening of the uterine wall is caused mainly by
a) LH
b) oxytocin
c) estrogen
d) FSH

2. What is the immediate effect of a high level of leutenizing hormone (LH) on the ovary?
a) delays menstruation
b

YMCMB   905   1 Reply

duddy

Human Reproduction and Development

Human Reproduction and Development

1. The thickening of the uterine wall is caused mainly by
a) LH
b) oxytocin
c) estrogen
d) FSH

2. What is the immediate effect of a high level of leutenizing hormone (LH) on the ovary?
a) delays menstruation
b

YMCMB   1067   2 Replies

duddy

Human Reproduction and Development

Human Reproduction and Development

15. Two components in semen that promote the sperms ability to travel to the ovum in the Fallopian tube are
a) fructose and alkaline buffers
b) fructose and testosterone
c) FSH and testosterone
d) FSH and alkaline buffers

YMCMB   747   1 Reply

duddy

Human Reproduction and Development

Human Reproduction and Development

1. Which reproductive structures are least similar in function
a) testes and ovaries
b) ductus deferens and fallopian tube
c) interstitial cells of testes and follicles of ovaries
d) ductus deferens and uterus

2. Some e

YMCMB   995   2 Replies

duddy

The archenteron of the developing frog eventually develops into the

The archenteron of the developing frog eventually develops into the

The archenteron of the developing frog eventually develops into the     
A) heart and lungs.
B) digestive tract.
C) brain and spinal cord.
D) blastocoel.
E) reproductive organs.

ppk   2946   2 Replies

ritamonteiro

A blastocyst differs from the spherical 16-cell morula in that the blastocyst is

A blastocyst differs from the spherical 16-cell morula in that the blastocyst is

A blastocyst differs from the spherical 16-cell morula in that the blastocyst is a sphere that contains..
a) An inner cell mass with germ layers that nourish the developing embryo
b) An inner cell mass with germ layers that will develop int

kasy110   4075   1 Reply

duddy

The above events in the sequence in which they occur during the reproductive

The above events in the sequence in which they occur during the reproductive

1) Pre-embryo release hCG, which maintains hormone levels
2) A hormones signals the follicle to rupture
3) Blastocyst is implanted
4) The egg is fertilized to form a zygote
 

kasy110   3490   5 Replies

bio_man

Consider the following model in answering the following questions.

Consider the following model in answering the following questions.

1)Consider the following model in answering the following questions.
Genotype: A1A1  A1A2  A2A2
Fitness:       1         1      1-s
a) What kind of selection does this model r

gh1991   1026   1 Reply

bio_man

The autonomic nervous system has minimal, if any control of

The autonomic nervous system has minimal, if any control of

7. The autonomic nervous system has minimal, if any control of
a) decreased intestinal peristalsis due to stress
b) muscular co-ordination required to write this exam
c) exam tension causing increased gastric tension
d) dilation o

YMCMB   1463   5 Replies

YMCMB

Hans Spemann and colleagues developed the concept of the primary organizer in am

Hans Spemann and colleagues developed the concept of the primary organizer in am

Hans Spemann and colleagues developed the concept of the primary organizer in amphibian embryos while studying the     

A) medial cells between the optic cups.
B) anterior terminus of the notochord.
C) dorsal lip

ppk   2509   2 Replies

A

Which of the following is the most basic process in the developing embryo becaus

Which of the following is the most basic process in the developing embryo becaus

Which of the following is the most basic process in the developing embryo because all of the other processes listed can occur only after it, or in conjunction with it?
A) organogenesis
B) cell differentiation
C) mitosis
D) mor

ppk   2156   1 Reply

how_mendel

Which of the following directors of embryonic development can be found in the un

Which of the following directors of embryonic development can be found in the un

Which of the following directors of embryonic development can be found in the unfertilized egg?
A) tissue-specific proteins
B) proteins in the organizer region
C) cytoplasmic determinants
D) mRNAs from embryonic genome
E

ppk   2417   1 Reply

how_mendel

Suppose an antibody to bindin was introduced into a chamber containing sea urchi

Suppose an antibody to bindin was introduced into a chamber containing sea urchi

Suppose an antibody to bindin was introduced into a chamber containing sea urchin sperm and eggs. What might be the result of this experiment?


A) Sperm would fertilize the eggs normally.
B) Sperm would not clump together.

ppk   1192   1 Reply

how_mendel

Many amphibian species release their sperm and eggs directly into a watery envir

Many amphibian species release their sperm and eggs directly into a watery envir

Many amphibian species release their sperm and eggs directly into a watery environment. All of the following mechanisms might ensure species-specific fertilization in these populations except ________.
A) acrosomal complexes in sperm.
B)

ppk   2089   1 Reply

how_mendel

The function of the acrosomal complex during fertilization is ________.

The function of the acrosomal complex during fertilization is ________.

The function of the acrosomal complex during fertilization is ________.
A) to block polyspermy.
B) to dissolve the coating of the egg.
C) to nourish the sperm mitochondria.
D) to permit maximum sperm motility.

ppk   3304   1 Reply

how_mendel

In mammals, the zona pellucida is digested during the process of fertilization.

In mammals, the zona pellucida is digested during the process of fertilization.

) In mammals, the zona pellucida is digested during the process of fertilization. This structure is probably similar to ________.
A) the cortical granules of the sea urchin egg.
B) the jelly layer of the sea urchin egg.
C) the vitel

ppk   1064   1 Reply

how_mendel

The allele D codes for right-handed coiling in a species of snail. The allele d

The allele D codes for right-handed coiling in a species of snail. The allele d

The allele D codes for right-handed coiling in a species of snail. The allele d codes for left-handed coiling. Assuming a maternal effect in phenotype, if a dd female mates with a Dd male, what percentage of offspring will show left-handed coiling?

ppk   1602   1 Reply

how_mendel

The allele D codes for right-handed coiling in a species of snail. Assuming no m

The allele D codes for right-handed coiling in a species of snail. Assuming no m

The allele D codes for right-handed coiling in a species of snail. Assuming no material effect, what percentage of offspring from the cross of a dd female with a Dd male will show left-handed coiling?
A) 0%
B) 25%
C) 50%
D) 75

ppk   966   1 Reply

how_mendel

During early cleavage in animal embryos, minimal growth of the embryo is observe

During early cleavage in animal embryos, minimal growth of the embryo is observe

During early cleavage in animal embryos, minimal growth of the embryo is observed, even though rapid cell division is taking place. How might this lack of growth be most easily measured without destroying the embryo?
A) oxygen uptake measuremen

ppk   1684   1 Reply

how_mendel

Where do you suppose the first microtubules will be observed in the fertiliz

Where do you suppose the first microtubules will be observed in the fertiliz

Where do you suppose the first microtubules will be observed in the fertilized egg?
A) immediately beneath the plasma membrane
B) at the site of sperm entry
C) opposite the site of sperm entry
D) around the nucleus

ppk   1150   1 Reply

lewis

Chordin is an organizer protein found only in the dorsal regions of Xenopus laev

Chordin is an organizer protein found only in the dorsal regions of Xenopus laev

Chordin is an organizer protein found only in the dorsal regions of Xenopus laevis embryos. An antibody to chordin might disrupt the determination of which structure?
A) central nervous system
B) digestive system    
C) kidneys
D

ppk   1359   1 Reply

lewis

During gastrulation in amphibians, the presumptive mesoderm moves into the inter

During gastrulation in amphibians, the presumptive mesoderm moves into the inter

During gastrulation in amphibians, the presumptive mesoderm moves into the interior of the embryo by following fibrils of fibronectin. The fibronectin is probably secreted by which cells?
A) endodermal cells on the exterior of the embryo

ppk   973   1 Reply

lewis

Scientists using RNA hybridization techniques found that a transcription factor

Scientists using RNA hybridization techniques found that a transcription factor

Scientists using RNA hybridization techniques found that a transcription factor called macho-1 localized to some cells during early cleavage, but not others. Descendents of these cells produce mesodermal derivatives. Which structures might not be fou

ppk   640   1 Reply

lewis

What happens during cleavage?

What happens during cleavage?

What happens during cleavage?
A) The neural tube?precursor of the spinal cord and brain?forms.
B) Basal and apical cells?precursors of the suspensor and embryo, respectively?form.
C) The fertilized egg divides without growth occurri

ppk   2951   1 Reply

lewis

What happens during gastrulation?

What happens during gastrulation?

What happens during gastrulation?
A) The neural tube?precursor of the spinal cord and brain?forms.
B) Basal and apical cells?precursors of the suspensor and embryo, respectively?form.
C) The fertilized egg divides without growth occ

ppk   2841   1 Reply

lewis

What is a major difference between the development of Drosophila or Xenopus and

What is a major difference between the development of Drosophila or Xenopus and

What is a major difference between the development of Drosophila or Xenopus and that of humans?
A) Drosophila and Xenopus do not undergo gastrulation; humans do.
B) Drosophila and Xenopus undergo metamorphosis; humans do not.
C) Dro

ppk   1235   1 Reply

lewis

One difference between early development in humans and in Xenopus is that ______

One difference between early development in humans and in Xenopus is that ______

One difference between early development in humans and in Xenopus is that ________.
A) in humans, there is no formation of the blastula; in Xenopus, the blastula is a critical stage in early embryogenesis.
B) in humans, blastocysts implan

ppk   1996   1 Reply

lewis

Spina Bifida is one of the most prevalent of human birth defects. The defect usu

Spina Bifida is one of the most prevalent of human birth defects. The defect usu

Spina Bifida is one of the most prevalent of human birth defects. The defect usually involves the spinal cord or the spinal canal opening to the outside of the body. In severe cases, movement of the legs may be limited or entirely absent. At which st

ppk   2379   1 Reply

lewis

Which of the following is the correct sequence in the development of specialized

Which of the following is the correct sequence in the development of specialized

Which of the following is the correct sequence in the development of specialized cells?

ppk   3288   1 Reply

lewis

What would be one clue that you are observing cell differentiation in a frog emb

What would be one clue that you are observing cell differentiation in a frog emb

What would be one clue that you are observing cell differentiation in a frog embryo?

ppk   1890   1 Reply

lewis

Sperm-egg interactions are species-specific in sea urchins, but not in mammals.

Sperm-egg interactions are species-specific in sea urchins, but not in mammals.

Sperm-egg interactions are species-specific in sea urchins, but not in mammals. What might be one reason for this difference?

ppk   2944   1 Reply

lewis

Cadherins and other cell-adhesion molecules that guide cell migration are

Cadherins and other cell-adhesion molecules that guide cell migration are

Cadherins and other cell-adhesion molecules that guide cell migration are     
A) ribonucleic acids.
B) steroid hormones.
C) prostacyclins.
D) fatty acids.
E) glycoproteins.

ppk   3261   4 Replies

bio_man

physiology assignment

physiology assignment

Considering all the data from both sets of experiments, can you make a blanket statement about whether PMC fate and cell differentiation is determined autonomously, or is regulated by other cells? If not, what can you conclude?

NAZ   1791   1 Reply

bio_man

What would be the consequence if gastrulation did not occur?

What would be the consequence if gastrulation did not occur?

A) The blastopore would form above the gray crescent in the animal pole
B) Cleavage would not occur in the zygote
C) Embryonic germ layers would not form
D) Fertilization would be blocked
E) The blastula would not be formed

sarahmariee   4718   1 Reply

ppk

Trophoblast

Trophoblast

Are Trophoblast always diploid, or do they reach a tetraploid state (specifically at the blastula stage).

The information I have in front of me is unclear to whether a trophoblast is 4N, or if a 4n cell is the result of a cell fusion.

StemCellRegen   1366   1 Reply

melissa

Explain two important sources of genetic variation in meiosis. Evolutionarily sp

Explain two important sources of genetic variation in meiosis. Evolutionarily sp

Explain two important sources of genetic variation in meiosis. Evolutionarily speaking, why do you think is it important that there is recombination of the genes in meiosis?

barry   3966   2 Replies

mz.bananaclipz