A Cross Is Made Between Yeast Cells with Different Alleles

question 36

Essay

A cross is made between yeast cells with different alleles for a set of linked genes: pr^+q × p^+rq+.The resulting tetrads show a 3:1 ratio for r⁺ to r instead of the expected 2:2 ratio.Can you explain how this could have occurred?

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Definitions:

Uterus

A major female reproductive organ of most mammals, including humans, responsible for housing and nurturing the embryo/fetus during pregnancy.

Menstruation

A monthly process in which the lining of the uterus is shed through the vagina if fertilization has not occurred.

Almond-shaped

Refers to something that resembles the shape of an almond, often used to describe certain body parts, like the amygdala in the brain.

Fimbriae

Thin, hair-like projections from the surface of a cell, organism or structure, often found in bacteria to aid in attachment to surfaces and in the female reproductive system to help move the ovum.