What is the predicted ratio of short-haired to long-haired offspring?

Question

Group of answer choices

2:4

1:4

3:1

1:3

Answer 1

To determine the predicted ratio of short-haired to long-haired offspring, we need to understand the genetic inheritance pattern involved. Generally, whether a trait like hair length is dominant or recessive determines the ratio.

Let’s break down a common scenario:

1. Assume short hair (S) is dominant to long hair (s).
2. If we cross two heterozygous short-haired parents (Ss x Ss), the resulting offspring would be:
   • SS (short hair)
   • Ss (short hair)
   • Ss (short hair)
   • ss (long hair)

The offspring genotypic ratio would be:

• 1 SS : 2 Ss : 1 ss

This means the phenotypic ratio of short-haired to long-haired offspring would be:

• 3 (SS and Ss) : 1 (ss)

Thus, the predicted ratio of short-haired to long-haired offspring would be 3:1.

So, the correct answer from the provided choices is:

3:1