A Paracentric Inversion Heterozygote Contains a Normal Chromosome with the Long-Arm

question 23

Essay

A paracentric inversion heterozygote contains a normal chromosome with the long-arm gene order GENE and an inverted chromosome with the long-arm gene order GNEE.They form an inversion loop to pair during prophase I of meiosis.If a single crossover occurs between the G and the E segments of the loop,what will be the gene orders in the resulting recombinant dicentric chromosome and acentric fragment? Assume crossing over occurs at the four-strand stage involving two nonsister chromatids.

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Definitions:

Retina

The light-sensitive layer of tissue at the back of the inner eye that converts light images into nerve signals sent to the brain.

Conjunctiva

The thin, transparent membrane that covers the white part of the eyeball and the inner surfaces of the eyelids.

Iris

The colored part of the eye surrounding the pupil, responsible for controlling the amount of light entering the eye.

Anatomical Structures

The various organs and parts of organisms, including humans, organized in a specific manner for biological functions.