Question

In cats grey color (G) is dominant to white color (g). If a white female has kittens with a heterozygous male, and the mother is showing that she will be having 9 Kittens, how many kittens would you expect to be white? (Round down to the nearest whole number, you cannot have partial kittens)

Answer 1

Rounding down to the nearest whole number, 5 Kittens will be white.

Step-by-step explanation:

Available data:

• grey color (G) is dominant
• white color (g) is recessive
• white female, gg
• heterozygous male, Gg
• 9 Kittens

Cross:

Parental) Gg x gg

Phenotype) Grey White

Gametes) G g g g

Punnet square)

G g

g Gg gg

g Gg gg

F1) Genotypes:

1/2 = 50% will be Gg

1/2 = 50% will be gg

Phenotypes:

1/2 = 50% will be Grey (Gg)

1/2 = 50% will be white (gg)

To calculate the number of kittens that will be white, we need to consider the proportions of cats that will be white in the F1 and that the total number of kittens is 9. So

100% of the progeny ------------------------------- 9 kittens

50% of the progeny----------------------------------X = (50 x 9)/100 = 4.5 kittens ≅ 5 Kittens

A cat can not have 4.5 kittens, so we must round down to the nearest whole number. 4.5 ≅ 5 Kittens