Question

"Elaine Ostrander and Gordon Lark collaborated on a project to analyze the genetic basis of body size in dogs. They used both genotype and phenotype information to identify the gene IGF1 that controls growth. The IGF1 gene has two alleles, I and B. Large dogs have the genotype II, and small dogs have the genotype BB. If heterozygous dogs are medium-sized dogs, what does this indicate about the pattern of inheritance?"

Answer 1

Answer:

The I and B alleles exhibit incomplete dominance.

Explanation:

When an animal or plant is said to be heterozygous, this means that its alleles are not dominant. For the heterozygous dogs to be medium-sized dogs, this shows that the I and B alleles as stated earlier did not exhibit complete dominance. What this means is that it borrowed some traits from large dogs and small traits from the small dogs and in terms of size, none of the dog types dominated.