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1. Give an example of two individuals who have the samephenotype, but different genotypes for the albinism gene. Explainhow two individuals with the same phenotype can have differentgenotypes.

2. For the corresponding phenotypes, the fraction with normalpigment is ______ and the fraction with albinism is ______, so thecorresponding ratio is ______.

3. Suppose a father has aa alleles and a mother has Aa alleles.Complete the Punnett Square to describe this mating and determinewhat fraction of this couple’s children would be expected to havealbinism.

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Related questions

2. Consider two gene loci in the mouse, locus1 and locus 2. Each locus is on a different, nonhomologousautosomal chromosome . Alleles at locus 1 influence fur color.Allele A is for black and allele a is for white.Allele A is completely dominant to allele a . Allelesat locus 2 influence stature; allele B is for tall andallele b is for short. Allele B is completelydominant to allele b.

Mouse 1, genotype Aa Bb, mates withfemale mice , genotype Aa Bb; 100 progeny are produced.



___: What fraction of the gametes from mouse 1is expected to be genotype Ab ?

___: What fraction of the gametes from mouse 1is expected to have allele a ?

___: What fraction of the progeny is expectedto be true-breeding for both stature and black fur?

___: How many progeny are expected to be tallwith white fur? Show your calculations.

___: How many progeny are expected to beheterozygous at both loci? Show yourcalculations.

___: If you randomly choose two progeny mice,one at a time, what is the probability that both mice are tall andwhite? Show your calculations.



3. Using the geneloci, alleles and phenotypes as described in question 2, considerthis mating between Mouse 3, black and tall, and mouse 4, black andtall. That mating produced these progeny: 58 black and short, 165black and tall, 25 white and short, 62 white and tall.



____: what is the expectednumber of progeny of the phenotypic class, black and short?Show your work.

____: What is the Chi-squarevalue for these observed and expected data? Show yourwork.

___: How many degrees offreedom are used for the Chi-square test in thissituation?

______: What is theapproximate Chi-square probability for this Chi-square value anddegrees of freedom?

_____: Mouse 3 mated withmice that had the phenotype short & white, and produced 200progeny. How many progeny are expected to have the phenotype, blackand tall?

____: In addition tothe gene loci, alleles and phenotypes described in question 1,consider a third gene locus with alleles D and d; D for long fur,and d for short fur. D is completely dominant to allele d. Thisgene locus segregates independently of the other two loci. Mouse 5,genotype Aa Bb Dd, mates with mouse 6 of the same genotype.What fraction of the progeny are expected to have the phenotype,black fur, tall & long fur?


I don't need the answers to question #2, justquestion #3. (the hilghted) However question 3 asks for informationfrom question 2, so that is why it is there


Thank you

There are also traits that have more than two alleles, one example of which is the ABO blood system that determines your dominant blood type. Most of you should know what type of blood you are. In the ABO blood system alleles A and B are co-dominant, and the O allele is recessive to A and B. Blood type A (phenotype) is found in individuals with genotypes AA or AO, while blood type B is found in individuals with genotypes BB or BO. The "O" blood type is only found in individuals with the genotype OO, and the blood type AB can ONLY be found in an individual with the genotype AB.

In this series of questions, you are working as a technician for the Maury Povich television show, and you need to determine the paternity of Sheila's baby. Sheila has blood type AB.

The first candidate for the father, Tony, has a known blood type of AO (type A blood). Which of the following Punnett squares illustrates the possible blood types of Sheila and Tony's offspring?

6.

When a parent who is heterozgyous for a trait is crossed with a parent who is heterozygous for a trait, the offspring will:

(remember homozygous means two of the same alleles and heterozygous means two different alleles)

Select one:

a. have 3 out of 4 the dominant phenotype and 1 out of 4 the recessive phenotype

b. have 2 out of 4 the dominant phenotype and 2 out of 4 the recessive phenotype

c. all have the dominant phenotype

d. have 1 out of 4 the dominant phenotype

7.

When a parent who is heterozgyous for a trait is crossed with a parent who is homozygous dominant for a trait, the offspring will:

(remember homozygous means two of the same alleles and heterozygous means two different alleles)

Select one:

a. all have the recessive phenotype

b. all will have the dominant allele

c. all be homozygous dominant genotype

8.

When a parent who is heterozgyous for a trait is crossed with a parent who is heterozygous for a trait, the offspring will:

(remember homozygous means two of the same alleles and heterozygous means two different alleles)

Select one:

a. have 3 dominant phenotypes, 2 heterozygous genotypes, and 1 homozygous recessive genotype

b. have 1 dominant phenotype, 2 heterozygous genotypes, and 1 homozygous recessive phenotype

c. have all dominant phenotypes, 2 heterozygous genotypes, and 1 homozygous recessive genotype

9.

When doing Punnett squares for fur, the letter f represents ______ and the letter F represents _____.

Select one:

a. the recessive allele, the dominant allele

b. the dominant allele, the recessive allele

c. the dominant gene, the recessive gene

d. the recessive gene, the dominant gene

10.

When a parent who is heterozgyous for a trait is crossed with a parent who is homozygous recessive for a trait, the offspring will:

(remember homozygous means two of the same alleles and heterozygous means two different alleles)

Select one:

a. be half heterozygous and half homozygous recessive

b. be all heterozygous

c. be all homozygous recessive

d. be all homozygous dominant

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