Mutations in maternal-effect genes are readily identified because
A) heterozygous mutant individuals are produced from homozygous mutant mothers.
B) homozygous mutant individuals from heterozygous parents can develop, but eggs laid by homozygous mutant females cannot develop.
C) heterozygous mutant individuals from homozygous parents can only develop normally if the mother is homozygous mutant.
D) heterozygous mutant females produce eggs that are not capable of normal development.
E) homozygous mutant individuals do not develop and are embryonic lethal.

Question

Quizplus · Accepted Answer

Mutations in maternal-effect genes are identifiable because homozygous mutant individuals can develop from heterozygous parents, but eggs laid by homozygous mutant females fail to develop. This is because the phenotype of the offspring is determined by the genotype of the mother, specifically the products (such as proteins) present in the egg.

Mutations in Maternal-Effect Genes Are Readily Identified Because