The Genes for Light Eyes Lt; Light and Straw Bristles

question 22

Essay

The genes for light eyes lt; light and straw bristles stw; straware tightly linked on chromosome 2 in Drosophila melanogaster.The Malpighian tubes of lt larvae and adults are maternally affected in that Malpighian tubes of lt/lt organisms,whose mothers were lt⁺/lt and have more yellow pigment than those from lt/lt mothers.There is no maternal effect associated with the straw locus.Give the phenotypes of the offspring from the following crosses.

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Definitions:

Flagella

Long, whip-like structures that protrude from the cell body of certain organisms, used for movement.

Selectively Permeable

A characteristic of cell membranes that allows certain molecules or ions to pass through it by means of active or passive transport, while blocking others.

Transport Proteins

Proteins that span the cellular membrane and regulate the movement of substances across it, essential for cellular function and homeostasis.

Cytoplasm

The jelly-like substance within a cell that contains the organelles and is enclosed by the cell membrane.