When mating fruit flies, you discover that a trait for body colour is controlled by a...
When mating fruit flies, you discover that a trait for body colour is controlled by a single gene with two alleles, the dominant allele causes black colouration and the recessive allele causes white colouration. Heterozygous individuals sometimes have white colouration and sometimes black colouration. What is a possible reason for this?
a. the alleles for the gene are codominant
b. the gene is showing complementary gene action
c. the dominant allele has incomplete penetrance
d. the gene has a dominance hierarchy
e. the gene is pleiotropic
explain please.
Homework Answers
C is correct answer because if dominant allele has compete penetrance, then heterozygous will be black only.
But in this case heterozygous are sometime black, sometime white means this allele is not completely dominant.
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