Question

“The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it.” Justify this statement with the help of flow chart showing determination of sex of a newborn. (3)

Answer 1

THE SEX OF CHILD DEPENDS ONLY ON THE KIND OF SPERM WHICH FERTILISES THE EGG.
ACCORDING TO THE LAW OF SEX DETERMINATION ,
Female has 2 X chromosomes n the male has 1 X chromosome n 1 Y chromosome along with 22 pairs of autosomes.
Female - 22 pairs + XX .
During gamete or egg formation reduction division takes place (meosis) n produces 22 +X chromosome in the egg.
all the eggs are of same type.
 Male- 22 pairs +XY .
so the sperms produced are of 2 types - 22 +X & 22 +Y.
When a sperm having 22 +X chromosome fuses with egg , a female  child  will be produced.[ 22 pairs +XX].
If a sperm having 22 +Y chromosome fuses with the egg , a male child will be produced.[22 pairs +XY].
THUS THE SEX OF THE CHILD DEPENDS ONLY ON THE KIND OF SPERM WHICH FERTILISES THE EGG.

Answer 2

The sex of the child determine the type of  sperm is released my the male gamet