When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype? A) 0% B) 25% C) 50% D) 75% E) 100%

C) 50%

Explanation:

Let the homozygous recessive organism be rr

Let the heterozygote be Rr

If both organism crosses together: Rr * rr

= we have (Rr, Rr, rr, rr) as their offspring.

The question says; what is the chance of producing an offspring with the homozygous recessive phenotype?

From above, the chance of producing an homozygous recessive is 50%.

i. e (2/4) * 100%

= (1/2) * 100%

= 50%