Dominant/Recessive?

Question

Assume that production of hairs on a plant's leaves is controlled by a single gene with two alleles H (dominant) and h (recessive). Hairy leaves are dominant to smooth (nonhairy) leaves.


What is genotype of a smooth-leaved plant?

What is genotype of a hairy leaved plant?

What are the possible genotypes of gametes produced by the smooth-leaved plant?

What are the possible genotypes of gametes produced by the hairy-leaved plant?

Answer 1

Genotype of smooth-leaved plant: HH or Hh
Genotype of hairy leaved plant: hh
Possible gametes of smoothed-leaved plant: Crossing HH and HH gives only HH (smooth), Crossing Hh and Hh gives HH (smooth), Hh (smooth) and hh (hairy), Crossing HH and Hh gibes HH (smooth) and Hh (smooth) - so the answer to this question is HH, Hh and hh
Possible gametes of hairy-leaved plant: Crossing hh and hh gives only the genotype hh

Answer 2

Since hairy (H) is dominant to smooth (h), then any sooth plant will have to be homozygous recessive (hh). A hairy plant could have two possible genotypes, HH or Hh. Usually, a problem will say something about a "true-breeding" hairy plant, which would mean that the plant is homozygous (HH).

You should be albe to answer the other two questions.