3 Imagine that you are studying coat color in a newly discov

3. Imagine that you are studying coat color in a newly discovered animal call the tribble. You have learned that one gene determines this trait, and that the two alleles of the gene have a simple relationship – the dominant allele results in a brown coat, while the recessive allele results in a white coat. In the F1 generation of a large number of monohybrid crosses you notice tribbles that have dark brown coats, medium brown coats, butterscotch colored coats, tan coats and white coats. Based on the information given, which of the following genetic phenomena best describes this trait? a. anticipation b. incomplete dominance c. incomplete penetrance d. overdominance e. variable expressivity f. variable expressivity and anticipation g. incomplete penetrance and variable expressivity

Solution

when the F1 progeny results in a range of coat colur from dark brown coats to white coat colur, The phenomena is called as Incomplete dominance.

In the incomplete dominance, none of the allele is completely dominant over the other allele and as a result, intermediate phenotypes are observed. The intermediate phenotypes have the heterozygous genotype.