Question

Drag each label to the correct location on the image.

Drepresents a dominant allele, and drepresents a recessive allele. Fill in the Punnett square to illustrate the offspring possibilities of one
heterozygous parent, and one homozygous recessive parent.
Dd
dd
d
d
D
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Answer 1

The offsprings of this punnet square will be Dd, Dd, dd and dd in a ratio 1Dd : 1dd

See attached image for punnet square completion

Step-by-step explanation:

This question involves a cross involving a single gene with alleles D and d where allele D is dominant over allele d i.e. D will mask the phenotypic expression of d in a heterozygous state.

This cross is between a heterozygous parent (Dd) and a homozygous recessive parent (dd). Parent Dd will produce gametes D and d while parent dd will produce gametes d and d.

Using these gametes in a punnet square, four possible offsprings with two distinct genotypes will be produced. The genotypes are: Dd and dd in a ratio 1:1

Hence, the possibility of having a heterozygous dominant offspring is 1/2 while the possibility of having a homozygous recessive offspring is also 1/2.