Genetics and Developmental Biology

What is the ratio for these genotypes and phenotypes?

What is the ratio for these genotypes and phenotypes?

HELP!!!!! I got these results RR,Rr,Rr,rr how do i express them as ratios for both genotypes and phenotype?

riverside07   392   1 Reply

riverfan

What are the four different phenotypes even thought there are six different genotypes?

What are the four different phenotypes even thought there are six different genotypes?

What are the four different phenotypes even thought there are six different genotypes?

rixter119   455   1 Reply

Tony2001

What are the possible genotypes and phenotypes for human blood types?

What are the possible genotypes and phenotypes for human blood types?

What are the possible genotypes and phenotypes for human blood types?

riverviewguit   1253   2 Replies

rixa85

How do homologous chromosomes code for phenotypes?

How do homologous chromosomes code for phenotypes?

Homologous chromosomes code for the same genes, so you typically have 2 versions of the same gene.  How do these 2 versions of these genes determine your phenotype?  If they have 2 versions of the same gene, which version is implemented?  Is it simpl

tony12   302   1 Reply

riverrat

Which of the following statements regarding genotypes and phenotypes is false?

Which of the following statements regarding genotypes and phenotypes is false?

Which of the following statements regarding genotypes and phenotypes is false?



 a. The genetic makeup of an organism constitutes its genotype.

 b. Alleles are alternate forms of a gene.

 c. The expressed physical traits of an organism are called

rivetcolin   3178   3 Replies

RiverTmasco

What would be the genotypes and phenotypes of the offspring if a blue wildcat were crossed with a red one?

What would be the genotypes and phenotypes of the offspring if a blue wildcat were crossed with a red one?

In northeast Ohio there is a creature known as a wildcat. It comes in three colors, blue, red, and purple. This trait is controlled by a single locus gene with incomplete dominance. A homozygous (BB) individual is blue, a homozygous (bb) individual i

rivers.butterfly   464   1 Reply

Tontin

In a cross involving plants with unknown genotype and phenotype, the following offspring were?

In a cross involving plants with unknown genotype and phenotype, the following offspring were?

In a cross involving plants with unknown genotype and phenotype, the following offspring were
obtained.
3/8 Smooth, green
3/8 Smooth, yellow
1/8 Rough, green
1/8 Rough, yellow
Determine the genotypes and phenotypes of the parents. (6pts)

nursestu   440   1 Reply

tony2012

What are the possible phenotypes of four offspring of plants?

What are the possible phenotypes of four offspring of plants?

If a homozygous, recessive, white flowered plant is bred with a heterozygous (white, recessive and red, dominant) plant, what is the possible phenotype of four offspring?

riverviewguit   277   4 Replies

Tontin

Why can woman be a carrier of a sex-linked trait without expressing that trait in her phenotype?

Why can woman be a carrier of a sex-linked trait without expressing that trait in her phenotype?

Why can woman be a carrier of a sex-linked trait without expressing that trait in her phenotype, while a man cannot? Please help.

rixter119   510   3 Replies

tony1653

If you had two organisms that showed a dominant phenotype(for a single trait), crossed them and observed three?

If you had two organisms that showed a dominant phenotype(for a single trait), crossed them and observed three?

If you had two organisms that showed a dominant phenotype(for a single trait), crossed them and observed three offspring with the dominant phenotype and one with the recessive phenotype, what were the most likely genotypes of the parents? What were t

tony12   357   1 Reply

rixter119

How do you work out this genetics problem?

How do you work out this genetics problem?

Given the parents AABBCc × AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?

 a. 1/4

 b. 1/8

 c. 3/4

 d. 3/8

 e. 1

trisha0474   594   3 Replies

moriahmck

What does hemizygous mean?

What does hemizygous mean?

Hi,

Quick question, do you use the phrase "hemizygous" when you are talking about sex chromosomes in a male? But you don't when you are talking about a female, right? Because they have two X chromosomes. Is there any other t

CooperS   857   3 Replies

bio_man

What is the Evolution of Neutral Mutation?

What is the Evolution of Neutral Mutation?

Hi,

From what I understand, the Evolution of Neutral Mutation was an idea proposed by Kimura in the 20th century that states that neutral mutations make up the majority of total mutations and they will all go to 100% in the population over

CooperS   348   1 Reply

flipinized007

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

what would you expect to happen to the frequencies of dark and light alleles in population of mice?

what would you expect to happen to the frequencies of dark and light alleles in population of mice?

what would you expect to happen to the frequencies of dark and light alleles in population of mice who live in an area with light-colored sandy soil with hawks as part of their natural community?

fire117   396   3 Replies

Livelove

Which of the following is true regarding dominance/recessiveness relationships of alleles?

Which of the following is true regarding dominance/recessiveness relationships of alleles?

Which of the following is true regarding dominance/recessiveness relationships of alleles?


a. These terms can only be used when discussing genes that are not affected by epistasis.
b. These relationships arise from the physical interaction of a do

Asmaa   381   1 Reply

riverviewguit

If an individual has genotype Aabb, how many different alleles does it have?

If an individual has genotype Aabb, how many different alleles does it have?

Also... how many gametes can it produce? What combinations of alleles are possible?

nurserock   724   1 Reply

julesxiii

An individual inherits 2 alleles for a single trait. Where do these alleles come from?

An individual inherits 2 alleles for a single trait. Where do these alleles come from?

An individual inherits 2 alleles for a single trait. Where do these alleles come from?

Nursesammy   556   2 Replies

fire4830

What does purebred recessive alleles mean?

What does purebred recessive alleles mean?

I'm doing a report on Gregor Mendels and it say that in one of his tests one in for peas had purebred recessive alleles and i think it might mean two identical purebred genes, but i'm not sure. CAn you please explain what it means or tell me if i'm r

jules101   840   1 Reply

smmunday

Which of the following is true about dominant alleles?

Which of the following is true about dominant alleles?

A) Dominant alleles are more important than recessive alleles.
B) Dominant alleles are healthier than recessive alleles.
C) Dominant alleles mask the presence of recessive alleles.
 D)Dominant alleles are more common in the population than recessive

RiveraCI   634   1 Reply

jules15

How can you determine one allele is dominant over another allele from haploid organism?

How can you determine one allele is dominant over another allele from haploid organism?

If you are given the phenotype of a haploid organism with a certain allele, would that be enough information to determine if the allele is dominant over another kind of allele?

Nursesammy   228   1 Reply

|R2r|

What is the sum of relative frequencies of all alleles for a particular trait?

What is the sum of relative frequencies of all alleles for a particular trait?

The sum of relative frequencies of all alleles for a particular trait is ___________.

riverviewguit   385   2 Replies

rivers.butterfly

Albinism in humans occurs when both alleles at a locus produce defective enzymes in the biochemical pathway l?

Albinism in humans occurs when both alleles at a locus produce defective enzymes in the biochemical pathway l?

a. One normal allele produces as much melanin as two normal alleles.
b. Each defective allele produces a little bit of melanin.
c. Two normal alleles are needed for normal melanin production.
d. The two alleles are codominant.
e. The amount of sunlig

nurserock   1438   1 Reply

smluke2000

What is a simple example of Multiple Alleles?

What is a simple example of Multiple Alleles?

I know Multiple Alleles is a gene having more than 2 alleles, i just dont know what to do for an example.

riveraj22   252   2 Replies

smluke2000

Question about the genetic code and alleles?

Question about the genetic code and alleles?

Hi, am i right in saying that when a child is being made sometimes the parents chromosomes can sometime crossover and exchange dna between, them, thus creating a new chromosome with different alleles on it for the child.
Now since the parent had a di

smm0030   304   3 Replies

asmitasharda

Can someone help me put these alleles / traits from the most recessive to most dominant?

Can someone help me put these alleles / traits from the most recessive to most dominant?

Can someone help me put these alleles / traits from the most recessive to most dominant?

Hair colours:

Red hair / Brown Hair (Brunette) / Black hair / Blonde hair

Eye colours:

Green eye / Blue eye / Brown eye / Hazel eye

Skin colour:

Dark skin

riveraj22   318   1 Reply

smn

What is the correct way to say Alleles?

What is the correct way to say Alleles?

I was doing before topic revision on genes and the word 'alleles' came up. So I asked Mr Howjsay and he pronounced it All[ee]les, with the ee sound. When my teacher was teaching the lesson she said it was sort of like ally,elles. I asked other scienc

riveraj22   170   1 Reply

nursenerd

If you have two dominant alleles, does that mean you will have that trait?

If you have two dominant alleles, does that mean you will have that trait?

Also, do you or do you not have the trait if the alleles or heterozygous? The only one I get in this stuff is that if you have two recessive alleles, you will not have said traits. I don't understand how the other two work, where you have 2 dominant

smn   257   2 Replies

Nurses911

If theres dominant and recessive alleles, will everyone eventually look the same?

If theres dominant and recessive alleles, will everyone eventually look the same?

Recessive alleles becomes less and less present as people keep having kids with different races. Is it possible that eventually everyone will look the same?

nursenerd   454   7 Replies

jules78245

What is the only true source of original variation in alleles?

What is the only true source of original variation in alleles?

What is the only true source of original variation in alleles?

   A. Mutations
   B. Genes
   C. Meiosis
   D. Natural selection
   E. Evolution

nursenor   327   3 Replies

Nursesammy

What aspects of chromosome behavior are responsible for the separation of alleles into gametes as well as for?

What aspects of chromosome behavior are responsible for the separation of alleles into gametes as well as for?

What aspects of chromosome behavior are responsible for the separation of alleles into gametes as well as for the tendency for traits to assort independently?

juldina1   262   1 Reply

firas kilani

I know that alleles are the diff.form of Genes and determine Genes.can anyone better explain what alleles are?

I know that alleles are the diff.form of Genes and determine Genes.can anyone better explain what alleles are?

Also what do Alleles and chromosomal disorders relate to. like how are they put in the same picture.

rivertube   448   3 Replies

RiveraCI

How to determine the frequency of both alleles and each genotype in the population.?

How to determine the frequency of both alleles and each genotype in the population.?

In cattle, black coat color is dominant to red coat. In a herd of 1000 cattle 750 have black coats. Determine the frequency of both alleles and each genotype in the population.?

Please help.

|R2r|   386   1 Reply

Jules3791

If you only get one allele each from your parents then how do you carry other 'hidden' alleles?

If you only get one allele each from your parents then how do you carry other 'hidden' alleles?

Like if both of my parents have brown eyes and I take on the two brown alleles then how could I possible produce a baby with blue eyes? I thought you could only have two alleles but what about the 'hidden' blue alleles that could be present? Are thes

jules101   337   4 Replies

RiveraCI

What is the name of an allele combination where any young inherit this would die in the uterus?

What is the name of an allele combination where any young inherit this would die in the uterus?

It says that the allele combination is also known as a "lethal combination" which results in a 2:1 ratio of fur colour in the surviving offspring.

HELP ME!

Nurses911   291   2 Replies

juldina1

Are alleles the same as the four nitrogen bases?

Are alleles the same as the four nitrogen bases?

Are alleles T,C,G, and A in DNA?
Or are alleles something else?

What exactly are they and where are they located in a gene?

firebucks74   277   3 Replies

smmoh4

What proportion of the alleles in the population is the recessive form (l)?

What proportion of the alleles in the population is the recessive form (l)?

Consider the following scenario. Northern Pike can have only big teeth or small teeth. Tooth size is controlled by a singe gene with 2 alleles.Large tooth size is dominant(L), and samll tooth size is recessive(l). A survey revealed that 51% of all no

nurseneo   392   1 Reply

smnam

For an autosomal gene with three alleles, a diploid cell may have up to how many different alleles of that gen?

For an autosomal gene with three alleles, a diploid cell may have up to how many different alleles of that gen?

For an autosomal gene with three alleles, a diploid cell may have up to how many different alleles of that gene?

0,1,2,3


PLEASE EXPLAIN

rivera5454   1050   2 Replies

nursenor

Are dominant alleles always the most common ones in a population?

Are dominant alleles always the most common ones in a population?

Are dominant alleles always the most common ones in a population? Explain?
:

firas kilani   1437   2 Replies

SMOKEY2112

How are codominance alleles and incomplete dominant alleles different?

How are codominance alleles and incomplete dominant alleles different?

I need help on my Biology work please!!
How are codominance alleles and incomplete dominant alleles different?

julesxiii   407   2 Replies

nursesms