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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.
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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
...