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Assignment: General Genetics Problems Name your submission Lastname_GeneticsProblems and submit it in the ‘Assignments’ link under the ‘Assessments’ tab on the course homepage. Each question worth 1 point. The maximum score for this assignment is 10 points. 1. In garden peas, yellow (Y) seed color is dominant to green (y). Because yellow and green are two different forms of the same gene (seed color), they are alleles. Use a Punnett square to show a cross between two heterozygous pea plants. What are the phenotype(s) of the offspring? What are the genotype(s) of the offspring? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 2. Assume that white color (W) is dominant over yellow color (w) in corn. Perform a Punnett square for a cross where pollen from the anthers of a plant that is heterozygous for color is placed on the pistil of a yellow-fruited plant. What are the genotypes and phenotypes you would expect to find from this cross? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ Use the information below to answer questions 3-6. There may be a number of possible alleles for a given gene within a population. In a multiple allele system the dominance relationships between the various alleles must be considered. One of the more familiar examples of a multiple allelic system is that of human ABO blood types. The gene involved codes for a protein on the outside of red bloods cells. Three alleles (IA, IB and i) determine whether the protein is present or absent and the form of the protein present. The A and B alleles code for the A and B forms of the protein and are co-dominant to each other. The O allele (i) codes for no protein and is recessive to both A and B 1 alleles. This means there are four possible blood types (A, AB, B, and O). 3. Show the possible genotypes and phenotypes of the offspring from a cross between a homozygous male with type A blood and a homozygous female with type B blood. __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 4. Show the possible genotypes and phenotypes of the offspring from a cross between a heterozygous male with type A blood and a heterozygous female with type B blood. __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 5. If a man with blood type A, one of whose parents had blood type O, marries a woman with blood type AB, what are the putative genotypes of the offspring? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 6. A man with type AB blood and a woman with type B blood have a baby has type O blood. Should there be any reason for concern? Why? __________________________________________________________________ __________________________________________________________________ 2 __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 7. In horses coat color shows incomplete dominance: the alleles are chestnut color (Hc) and cremello (Hcr); heterozygous individuals have the phenotype palamino. What are the predicted phenotypes from a cross between a palamino and cremello colored horses? What are the genotypes? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 8. Red-green color blindness is inherited as an X-linked recessive (XC). If a color-blind man marries a woman who is heterozygous for normal vision, what would be the expected phenotypes of their children with reference to this character? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 9. Hemophilia is another example of a X-linked disease caused when a recessive allele (Xh) is expressed. If a normal male reproduces with a heterozygous normal female, what are the expected genotypes and phenotypes? Will any of their daughters develop hemophilia? __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 10. In pea plants, seed shape and seed color are controlled by genes located on different chromosomes. Seeds may be round (R) or wrinkled (r), with the allele for round seeds being dominant. Alleles for seed color are yellow and green, with 3 the green allele (y) recessive to the yellow (Y) allele. If you cross an individual that is homozygous round and yellow with an individual that is homozygous for wrinkled and green, what is the genotype of the F1 individuals? Set up a Punnett square for the dihybrid cross. __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ 4
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Assignment: General Genetics Problems
Name your submission Lastname_GeneticsProblems and submit it in the
‘Assignments’ link under the ‘Assessments’ tab on the course homepage. Each
question worth 1 point. The maximum score for this assignment is 10 points.

1. In garden peas, yellow (Y) seed color is dominant to green (y). Because yellow
and green are two different forms of the same gene (seed color), they are alleles.
Use a Punnett square to show a cross between two heterozygous pea plants. What
are the phenotype(s) of the offspring? What are the genotype(s) of the offspring?
The parents are heterozygous pea plants, which means they both are Yy.
Genotypes with YY and Yy are yellow, while yy plants are green.
Punnett

Y

y

Y

YY

Yy

y

Yy

Yy

The phenotypes of the offspring are Yellow and Green. ¾ of the offspring are
yellow and ¼ are green.
The genotypes of the offspring are YY, Yy, and yy.
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
2. Assume that white color (W) is dominant over yellow color (w) in corn.
Perform a Punnett square for a cross where pollen from the anthers of a plant that
is heterozygous for color is placed on the pistil of a yellow-fruited plant. What
are the genotypes and phenotypes you would expect to find from this cross?
One parent is Ww while the other must be ww since yellow is recessive.
Genotypes with WW and Ww are white, while ww plants are green.
Punnett

w

w

W

Ww

Ww

...


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