Question

The image shows the distribution of type of sex chromosome in males and females. Based on the image, when will a male child be born?





(a) When an egg with X chromosome will fuse with a sperm with X chromosome.

(b) When an egg with Y chromosome will fuse with a sperm with Y chromosome.

(c) When an egg with Y chromosome will fuse with a sperm with X chromosome.

(d) When an egg with X chromosome will fuse with a sperm with Y chromosome.

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Answer 1

Answer:

D is the answer

Explanation:

because sex of the child is depend on the father or sperm ....

so sperm contain Y and egg with X then there will be male child

...

hope u like my answer

Answer 2

The chromosomal composition for a male to develop is:

(d) When an egg with X chromosome will fuse with a sperm with Y chromosome.

Explanation:

The chromosomal composition for a male to develop during fetertilization is:

(d) When an egg with X chromosome will fuse with a sperm with Y chromosome.

• The genetic composition of a Male is 46 chromosomes - XY + 44 allosomes, that is 2 sex chromosomes and 44 allosomal chromosomes.
• The genetic composition of a Female is 46 chromosomes - XX + 44 allosomes, that is 2 sex chromosomes and 44 allosomal chromosomes.
• During meiotic and mitotic  the cells divisions, the genetic material is assorted and forms haploid gametes. As there are two genes X and Y present both are carried into the gametes.
• The haploid male gametes have a genetic composition of either X or Y with allosomes in each sperm. The 50% sperms have X chromosome and other 50% sperms have Y chromosome.
• The haploid female gamete has only a X gene and allosomes.
• Therefore  an egg with X chromosome has fuse with a sperm with Y chromosome to form a male progeny.