Question

in mice, coat color is incompletely dominant. yellow (y) and white (w) colored mice are homozygous, while cream (yw) colored mice are heterozygous. if two cream-colored mice mate, what percentage of each phenotype is probable of their offspring?

Answer 1

Two cream (Yw) mice have a 25% probability of producing a yellow (YY) offspring, a 50% probability of producing a cream (Yw) offspring, and a 25% probability of producing a white (ww) offspring.

Step-by-step explanation:

When two cream-colored mice mate (heterozygous Yw), there is a 25% chance of a yellow offspring (YY), a 50% chance of a cream offspring (Yw), and a 25% chance of a white offspring (ww).

Here's a detailed explanation using a Punnett square, which is a grid that shows the possible genotypes of offspring based on the genotypes of the parents. In this case, both cream-colored parents have the genotype Yw. The Punnett square will have four cells, each representing a possible genotype of the offspring.

• Y from one parent and Y from the other parent result in a yellow mouse (YY), which is 25% likely.
• Y from one parent and w from the other parent, or vice versa, gives a cream mouse (Yw), with two possible combinations each with a 25% chance, adding up to 50% for cream offspring.
• w from one parent and w from the other parent give a white mouse (ww), which is again 25% likely.