Question

In fruit flies, long wings are dominant over short wings. Which of the following must be true about the genetic material of a fruit fly with long wings?
Responses

It must be homozygous for long wings OR homozygous for short wings.
It must be homozygous for long wings OR homozygous for short wings.

It must be heterozygous for short wings OR homozygous for short wings.
It must be heterozygous for short wings OR homozygous for short wings.

It must be homozygous for long wings OR heterozygous for long wings.
It must be homozygous for long wings OR heterozygous for long wings.

It must be heterozygous for long wings OR heterozygous for short wings.
It must be heterozygous for long wings OR heterozygous for short wings.

Answer 1

It must be homozygous for long wings OR heterozygous for long wings.

Reason: A dominant trait (long wings) is expressed in both homozygous dominant (LL) and heterozygous (Ll) genotypes. The recessive trait (short wings) appears only in homozygous recessive (ll).