Genetics and Developmental Biology

Mutations may exert a variety of effects on living systems. List at least three

Mutations may exert a variety of effects on living systems. List at least three

Mutations may exert a variety of effects on living systems. List at least three categories of mutations based on their biological effects.

colleen   824   1 Reply

duddy

Three major types of RNAs are mRNA, rRNA, and tRNA. For each of the conditions b

Three major types of RNAs are mRNA, rRNA, and tRNA. For each of the conditions b

Three major types of RNAs are mRNA, rRNA, and tRNA. For each of the conditions below, predict the consequences in terms of the population of proteins being synthesized in a particular cell. What qualitative and quantitative changes, if any, are expec

colleen   824   2 Replies

colleen

Do gay people exist for a certain purpose?

Do gay people exist for a certain purpose?

hi! This question has been on my mind lately. I am wondering if gay people are actually nature's way of keeping the population under control. I think everyone knows that procreation is impervious for the survival of our species but too much of i

feralTiger94   824   6 Replies

savio

What is the genetic disorder sickle cell disease is an example of?

What is the genetic disorder sickle cell disease is an example of?

A. pleiotropy  B. heterozygous dominance  C. epistasis  D. homozygous dominance

Correct answer gets 5 stars, thanks for your help!

trish.mortel   824   1 Reply

onemustfall!

Genetic relatedness between different species (e.g. humans, chimps)

Genetic relatedness between different species (e.g. humans, chimps)

Hi there,

This isn't a homework question as much as a "what do they mean in this nature documentary" question.

They say that full siblings are 50% genetically related, and I get that: on average, at 50% of genes,

bruin   825   5 Replies

bio_man

In terms of cellular differentiation and developmental potential, embryonic stem

In terms of cellular differentiation and developmental potential, embryonic stem

In terms of cellular differentiation and developmental potential, embryonic stem cells are best described as being which of the following?
    Pluripotent
    Committed
    Terminally differentiated
    Totipotent

jakeman93   825   3 Replies

padre

NEED HELP FIRST BIOLOGY CLASS EVER

NEED HELP FIRST BIOLOGY CLASS EVER

i understand the define questions but not the rest....

Homework help please.

Spent hours looking around how to do most these.

Post Merge: 11 years ago

Attached the file i need hel

VenomEnergy   825   4 Replies

bio_man

In a dihybrid cross between a parent that is a double heterozygote (AaBb) and a parent that is homozygous?

In a dihybrid cross between a parent that is a double heterozygote (AaBb) and a parent that is homozygous?

recessive (aabb), how many different phenotypes will there be in their offspring. List the specific amounts. If you can put a Punnet Square in that would be great!

mike13m   825   1 Reply

lgood4

Human genetics

Human genetics

1. Is night blindness( congenital& acquired) related to X chromosome?
2. 1. A hemophiliac man marries a carrier woman. What is the percentage of daughters becoming hemophiliac? Explain.

Avradeep   826   2 Replies

Avradeep

Unanswered please help

Unanswered please help

One-thousand individuals were screened for their genotype at the MN blood group locus. The numbers of each genotype were:
MM

MN

NN

298

489

213

Assuming random mating, calculate th

rwald001   826   3 Replies

ehd123

What type of alleles can shorten the life span of an organism?

What type of alleles can shorten the life span of an organism?

Does anyone know?  I need to find out what this type of alleles is called, and an example in real life.
For example, if an organism has three eyes, it will only be able to live 3 years (rather than a longer period of time).  this is just an example,

firebolt   826   1 Reply

bio_man

Name three broad categories of heritable traits that help characterize a population?

Name three broad categories of heritable traits that help characterize a population?

Is it mutation cross over and independent assortment?

julianbato   826   4 Replies

nutcake852

You discover a prokaryote that can make its own food in the absence of light. Nu

You discover a prokaryote that can make its own food in the absence of light. Nu

biology

baruch   827   1 Reply

Pranit Ingale

Which histone protein is not part of the nucleosome structure?

Which histone protein is not part of the nucleosome structure?

Which histone protein is not part of the nucleosome structure?
A) H1
B) H2A
C) H2B
D) H3
E) H4

mikael   827   2 Replies

mikael

When environmental factors influence gene expression, this is referred to as:

When environmental factors influence gene expression, this is referred to as:

When environmental factors influence gene expression, this is referred to as:
A) polygenic inheritance.
B) multifactorial inheritance.
C) codominance.
D) multiple alleles.

Cali Fornia   828   2 Replies

Cali Fornia

A round or oval opening through a bone is a:

A round or oval opening through a bone is a:

A round or oval opening through a bone is a:
A) facet
B) fossa
C) foramen
D) fissure
E) trochanter

barry   828   2 Replies

barry

A researcher needs to clone a particular DNA sequence to express the sequence?

A researcher needs to clone a particular DNA sequence to express the sequence?

A researcher needs to clone a particular DNA sequence to express the sequence and also modify the polypeptide product. Which of the following vectors would allow her to satisfy both of these requirements?


1) A bacterial plasmid
 2) A human chromoso

Lena N.   828   1 Reply

michaelavam

Determine the original DNA code for part of a hemoglobin protein molecule

Determine the original DNA code for part of a hemoglobin protein molecule

determine the original DNA code for part of a hemoglobin protein molecule, especially for the 3 amino acid chain of threonine- proline- glutamate.

procedure:

a. write out the codon for each amino acid as used in the text

ellie__   828   3 Replies

Rohzer

I need help with Genetic breeding in flowers.

I need help with Genetic breeding in flowers.

In a species of lily, purple flowers are dominant to yellow flowers. Brown spots on the petals are dominant to orange spots. A plant breeder has a true breeding purple lily with brown spots. She also has a true breeding yellow lily with orange spots.

Angela95   828   4 Replies

avarma

based on normal meiosis, how many chromosomes would the human gamete have?

based on normal meiosis, how many chromosomes would the human gamete have?

suppose a researcher claims o be able to make a hybridanimal that is a cross between a human and a rhesus monkey. the normal diploid number for humans is 46, andthe normal diploid number for rhesus monkeys is 48. Based on the normal meiosis, how many

rlcdiver   829   1 Reply

rk90

Biology Genetics Test Cross Question?

Biology Genetics Test Cross Question?

In a cross between a female AaBbccdd and a male AabbCcDd, what proportion of the progeny will be phenotypically identical to the female parent? (Assume independent assortment of all genes and complete dominance).
A. 1/8
B. 3/32
C. 1/64
D. 9/16
The

rkkovach   829   3 Replies

davesf4i

Mutations that eliminate a contiguous region in the Drosophila embryo's segmenta

Mutations that eliminate a contiguous region in the Drosophila embryo's segmenta

Mutations that eliminate a contiguous region in the Drosophila embryo's segmentation pattern are called ________.
A) homeodomains
B) gap genes
C) compartment genes
D) linkage genes
E) segment genes

Our teacher a

nite_n_day   831   3 Replies

germ

Which of the following is NOT a means of regulating gene expression?

Which of the following is NOT a means of regulating gene expression?

Which of the following is NOT a means of regulating gene expression?
A. Modifying proteins after they are synthesized.
B. Deleting genes from cells in which they are not needed.
C. Varying the rate at which DNA is transcribed into messenger RNA.
D. R

midwestmama   831   1 Reply

mid_stuck_dle

TATA box and GAL1 transcription reduction

TATA box and GAL1 transcription reduction

Why is there a reduction in transcription when a point mutation on the GAL1 promoter alters the sequence of TATA box?

Rahpoo   832   1 Reply

bio_man

exon shuffling

exon shuffling

what is         exon shuffling       and        what are the mechanisms of exon shuffling?   

fareh   832   3 Replies

fareh

Of the three mechanisms leading to autopolyploidy, which is the most rare event?

Of the three mechanisms leading to autopolyploidy, which is the most rare event?

Of the three mechanisms leading to autopolyploidy, which is the most rare event?

mikael   833   2 Replies

mikael

Compare and contrast the chromosome structure of viruses, bacteria, and eukaryot

Compare and contrast the chromosome structure of viruses, bacteria, and eukaryot

Compare and contrast the chromosome structure of viruses, bacteria, and eukaryotes. 

colleen   833   2 Replies

colleen

Why does mitosis not result in haploid cells, while it does in meiosis 2, when the sister chromatids separate?

Why does mitosis not result in haploid cells, while it does in meiosis 2, when the sister chromatids separate?

if both have their sister chromatids separate, then why does mitosis end with diploid numbers of chromosomes, while meiosis ends in a haploid number of chromosomes.

rkarthik301   833   3 Replies

rlfowler

If curly hair is a dominant trait, then why do so many people have straight hair?

If curly hair is a dominant trait, then why do so many people have straight hair?

why do so many people have straight hair?
i don't get it.

sm454361   833   4 Replies

smag

Genetics/Sex Determination

Genetics/Sex Determination

XYY humans are fertile males. XXX humans are fertile females. What do these observations reveal about the mechanisms of sex determination and dosage compensation?

ela   833   1 Reply

duddy

In a cross between a petite yeast mutant and a wild-type strain, results showed

In a cross between a petite yeast mutant and a wild-type strain, results showed

In a cross between a petite yeast mutant and a wild-type strain, results showed some petite and some wild-type outcomes. Which of these statements must be true of this petite mutation?
A) It is suppressive.
B) It is a nuclear or segregation

mikael   834   2 Replies

mikael

Please help me!In a conjugartion experiment, F+ cells (donors) carrying a chromo

Please help me!In a conjugartion experiment, F+ cells (donors) carrying a chromo

In a conjugartion experiment, F+ cells (donors) carrying a chromosomal copy of a gene that confers resistance to mercury (merr) were mated with F- cells (recipients) carrying a chromosomal copy for the resistance to tetracyclin. The F+ plasmid encode

yolanda   834   1 Reply

George

Twins that result from two different ova are called ________.

Twins that result from two different ova are called ________.

Twins that result from two different ova are called ________. 

nite_n_day   835   2 Replies

nite_n_day

What term describes a structure that protects the ends of a chromosome?

What term describes a structure that protects the ends of a chromosome?

What term describes a structure that protects the ends of a chromosome?
A) Telomere
B) Centromere
C) Chromatid
D) Histone

thank you

julesh22   835   1 Reply

buggmoma10

What is the chance that a sperm carrying an X chromosome will be the first to fertilize the ovum?

What is the chance that a sperm carrying an X chromosome will be the first to fertilize the ovum?

Hi,

For school i have to answer this question could you help me. Thanks

What is the chance that a sperm carrying an X chromosome will be the first to fertilize the ovum?

lexiie   835   8 Replies

julesh22

Krista is having difficulty with the progression of labor. Her obstetrician administers a hormone to ...

Krista is having difficulty with the progression of labor. Her obstetrician administers a hormone to ...

Krista is having difficulty with the progression of labor. Her obstetrician administers a hormone to assist with her uterine contractions. This hormone is a synthetic version of:
A) estrogen.
B) oxytocin.
C) human chorionic gonadotropi

Cali Fornia   836   2 Replies

Cali Fornia

Viral chromosomes exist in a variety of conformations and can be made up of ____

Viral chromosomes exist in a variety of conformations and can be made up of ____

Viral chromosomes exist in a variety of conformations and can be made up of ________.
A) protein- or lipid-coding sequences
B) DNA only
C) DNA or RNA
D) RNA only
E) DNA, RNA, or protein

Our teacher assigned this from

nite_n_day   836   3 Replies

germ

Assume that in the F2 of a series of crosses, 1/256 of the progeny resemble one

Assume that in the F2 of a series of crosses, 1/256 of the progeny resemble one

Assume that in the F2 of a series of crosses, 1/256 of the progeny resemble one of the parents.  How many gene pairs are involved in producing these results? 

jhmlton6   836   1 Reply

padre

What Are Four Possible Genotypes and Phenotypes from a dihybrid cross?

What Are Four Possible Genotypes and Phenotypes from a dihybrid cross?

What Are Four Possible Genotypes and Phenotypes from a dihybrid cross?

lgood4   836   3 Replies

mike000412

What are LINES?

What are LINES?

What are LINES?

colleen   837   6 Replies

colleen