Question

An abnormal human female phenotype,involving absence of X-chromosome is a case of (1)Klinefelter's syndrome (2) Turner syndrome (3)Intersex (4)Down's syndrome

Answer 1

Answer:

An abnormal human female phenotype, involving absence of X-chromosome is a case of Turner syndrome

Explanation:

Turner syndrome is a disorder, that caused due to the absence of an X-chromosome. The Females, who are only affected by the syndrome, have their chromosome number, $45$ with X0. Such females have rudimentary ovaries and lack other female features like secondary sexual characters, making them sterile.

Klinefelter's syndrome is caused due to the presence of an additional copy of X-chromosome, which results in a karyotype of $47$, XXY. Males are only affected by this syndrome.

Down's syndrome is caused due to the presence of an additional copy of chromosome number $21$ (trisomy $21$). Both males and females are affected by this syndrome.

Intersex is a group of conditions in which the sex characteristics of such people do not fit into the typical male or female characteristics. They may show the chromosome number as $46$,XX or $46$, XY.

Answer 2

An abnormal human female phenotype, involving the absence of X-chromosome is a case of (2) Turner syndrome.

What is Turner syndrome?

• It is a rare chromosomal disorder that occurs in females due to the absence of one X chromosome.
• Turner syndrome affects the development of females. Symptoms include webbed neck, low hairline, short height, heart problems underdeveloped feminine characters etc.
• Ovaries are present but they are not completely developed and hence, such females are generally sterile.