organism and genes?

Question

In an organism, two separate genes influence the length of the hair. The allele for long hair, L, dominates teh allele for short hair, l. The allele for hair, H, dominates the hairless allele, h. In the cross between parents of genotype LlHh and llHh, what ratio of phenotypes would you expect to see?


8 long haired; 8 short haired.

4 long haired; 3 short haired; 1 no hair

9 long haired; 3 short haired; 4 no hair

3 long haired; 3 short haired; 2 no hair

Answer 1

Parents LlHh x llHh will produce offspring in these ratios:
Ll x ll gives 1 long: 1 short.
Hh x Hh gives 3 haired: 1 hairless

Multiply these two ratios together for the total picture ...

3 long, haired: 1 long, hairless: 3 short, haired: 1 short, hairless

Combine hairless into one category because they won't be long or short haired if they don't have any hair.

3 long, haired: 3 short, haired: 2 no hair.

Answer D is correct.