Question

Male XX and female XY sometime such conditions occur due to
A. Deletion
B. Transfer of segments in X and Y chromosomes
C. Aneuploidy
D. Hormonal imbalance

Answer 1

Hint:The chromosomes which contribute towards the developing sex of a person are called sex chromosomes. The X chromosome and Y chromosome are the sex chromosomes of human beings. Most women have XX chromosomes and the males have XY chromosomes. But some males may have XX chromosomes and females may have XY chromosomes. These conditions in which males have XX chromosomes instead of XY chromosomes and females have XY chromosomes instead of XX chromosomes may occur due to the transfer of segments in X and Y chromosomes.

Complete answer:The process in which part of a chromosome or a particular sequence of DNA is deleted during replication of DNA is called a deletion. During deletion, any number of nucleotides can be deleted from a single base to an entire piece of chromosome.
The accidental crossing over which occurs during parental meiosis results in the transfer of segments in X and Y chromosomes which may lead to the formation of males with XX chromosomes and females with XY chromosomes.
A typical human cell has 46 chromosomes. If a cell has an abnormal number of chromosomes that are 45 or 47 chromosomes instead of 46 chromosomes, this condition is known as aneuploidy.
The chemical molecules secreted by an endocrine gland are called hormones. Whenever there are too few or too many hormones in the bloodstream may cause a condition known as hormonal imbalance.

Hence the possible correct option is B.

Note: Deletion is a type of crossing over. Deletion is a type of crossing over. It can remove a single nucleotide, or the whole sequences of nucleotides. Deletion has been occurring when new DNA slips on a template DNA strand, effectively missing a nucleotide.