Dosage Compensation in Mammals Typically Involves the Random Inactivation of One

question 48

Short Answer

Dosage compensation in mammals typically involves the random inactivation of one of the two X chromosomes relatively early in development.Such X chromosome inactivation often leads to phenotypic mosaicism.Assume that black fur in cats is due to the X-linked recessive gene b,whereas its dominant allele B produces yellow fur.A Bb heterozygote is a mosaic called "tortoise shell" or "calico." Using appropriate gene symbols,diagram a mating between a black male and a calico female.Give the phenotypes and genotypes of all the offspring.

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Definitions:

Contraceptive Method

Techniques or devices used to prevent pregnancy, including hormonal pills, barriers, or natural methods.

Condom

a barrier device used during sexual intercourse to reduce the probability of pregnancy and the spread of sexually transmitted infections.

Menopause

The period marking the end of a woman's reproductive years, characterized by the cessation of menstruation and marked hormonal changes.

Age-Related Changes

Natural transformations and modifications that occur in the human body as part of the aging process.