In cells with more than one X chromosome, one X chromosome is inactivated. The opsin1 gene is onthe X chromosome and is expressed in the retinal cells of the eye. Mutations in this gene cause therecessive trait of colorblindness. Most women who have one mutant allele of the opsin1 gene andone normal allele of the opsin1 gene (they are heterozygous) can still see color. What is the mostlikely explanation for this finding?O Any mutations in the opsin1 gene on the active X can be corrected through genetic exchange (recombination)with the inactive XO If the active X has the mutant allele of opsin1 gene, the inactive X with the normal allele will be reactivatedThe X with the mutant allele of the opsin1 gene is more likely to be inactivated because of the opsin1mutationSome retinal cells will have an active X with the mutant allele of the opsin1 gene, and some will have an activeX with the normal allele of the opsin1 gene

Answered: In cells with more than one X…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

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In cells with more than one X chromosome, one X chromosome is inactivated. The opsin1 gene is on
the X chromosome and is expressed in the retinal cells of the eye. Mutations in this gene cause the
recessive trait of colorblindness. Most women who have one mutant allele of the opsin1 gene and
one normal allele of the opsin1 gene (they are heterozygous) can still see color. What is the most
likely explanation for this finding?
O Any mutations in the opsin1 gene on the active X can be corrected through genetic exchange (recombination)
with the inactive X
O If the active X has the mutant allele of opsin1 gene, the inactive X with the normal allele will be reactivated
The X with the mutant allele of the opsin1 gene is more likely to be inactivated because of the opsin1
mutation
Some retinal cells will have an active X with the mutant allele of the opsin1 gene, and some will have an active
X with the normal allele of the opsin1 gene

Expert Solution

Step 1: Understanding the Scenario

In individuals with two X chromosomes, a phenomenon known as X chromosome inactivation occurs, wherein one of the X chromosomes is randomly rendered inactive inside each cell. The phenomenon of X chromosome inactivation serves to prevent females from having a double dosage of X-linked genes in comparison to males. Colorblindness is a recessive characteristic that may arise due to mutations occurring in the opsin1 gene located on the X chromosome.

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