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Chapter 13: Problem 19

Explain why a female cannot have \(X X Y\) syndrome and a male cannot have \(X O\) syndrome.

Short Answer

Expert verified
Females can't have XXY syndrome because this condition implies the presence of an extra sex chromosome (Y), which is not characteristic of the female's usual XX chromosome pair. On the other hand, males can't have XO syndrome because the Y chromosome is notably absent, contradicting male's typical XY sex chromosome pair.

Step by step solution

01

Understanding Female Genetics

The normal genetic makeup of females comprises two X chromosomes (XX). These chromosomes play crucial parts in determining up an individual's sex. In the case of XXY, it would imply that an individual has an extra sex chromosome which is not characteristic of female genetic makeup.
02

Understanding Male Genetics

Males are generally characterized by one X and one Y sex chromosome (XY). The Y sex chromosome carries the essential genes needed to determine male sexual differentiation. Therefore, in the case of XO, it would imply that an individual lacks the Y chromosome, suggesting the absence of factors that command the shift of development from the default female pathway towards male differentiation.
03

The Impossibility of XXY in Females and XO in Males

Since the presence of the Y chromosome essentially determines male sex and an extra X chromosome (as in XXY syndrome) is not naturally found in females, a female cannot have XXY syndrome. Similarly, since the Y chromosome is absent in XO syndrome, which counters the basic genetic structure of a male, a male cannot have XO syndrome.

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Most popular questions from this chapter

About 80 percent of cases of Edward syndrome are caused by trisomy \(18 ; 10\) percent are caused by mosaic trisomy \(18,\) and 10 percent are attributed to translocation. Distinguish among these three chromosome aberrations.

What happens during meiosis to produce a. an aneuploid? b. a polyploid? c. increased risk of trisomy 21 in the offspring of a woman over age 40 at the time of conception? d. recurrent spontaneous abortions to a couple in which the man has a pericentric inversion? e. several children with Down syndrome in a family where one parent is a translocation carrier?

Distinguish among three types of translocations.

Identify the structures and/or DNA sequences that must be present for a chromosome to carry information and withstand the forces of cell division.

Define or describe the following technologies: a. FISH b. amniocentesis c. chorionic villus sampling d. cell-free fetal DNA analysis
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