Question

The bicoid (bcd) gene in Drosophila melanogaster has a role in establishing the polarity of the insect larva early in development. When homozygous in the maternal parent, a mutation in bcd has no effect on the parent but causes failure of anterior development in all of the offspring. The developing larvae have two abdomens, lack a head and fail to develop fully to adulthood. Suppose that a female fruit fly that is homozygous for a mutated bicoid gene (bcd-) mated with a wild-type male. What would be the phenotype of the progeny?

Answer 1

Answer and Explanation:

A maternal impact quality is a quality the incipient organism doesn't express, rather, it is a quality the mother communicates, that by one way or another has an effect on the improvement of the hatchling. Models incorporate qualities that decide extremity of the incipient organism, and qualities that decide the body plan of the developing life, for example, bicoid in Drosophila, which decides head and thorax position.

The bicoid quality figures out which end is the front finish of the fetus. A homozygous transformed bicoid quality outcomes in the absence of foremost fragments, for example, mouth parts, head, and the initial two thoracic portions. It additionally brings about a hatchling creating two back closures (thus the name bicoid).

The phenotype of the hatchlings will be typical, since the mother is ordinary, and it is a maternal impact quality.

The descendants would be transformed as depicted above