Question

In Mendelian monohybrid cross, phenotypic ratio in F${}_2$ is 3:1. How many types of gametes are formed in F${}_1$ generation?

• A. Only one type
• B. Two types
• C. Four types
• D. Eight types

Answer 1

Answer: (B)

Two types

When homozygous dominant and homozygous recessive alleles are crossed, it gives F${}_1$ generation.
RR x rr -----------> Rr
The gametes produced by Rr: R and r. Thus, two types of gametes are formed in F${}_1$ genertation.