Question

Describe how the sxe of the offspring is determined in the zygote in human beings?

Answer 1

Answer

the sex of offspring is completely based on what happens during fertilisation.

in males there are 23 chromosomes in which one pair is of sex chromosomes therefore the composition is - 22+ XY

whereas in females it is 22+ XX

during fertilization there are equal chances of birth of both male and female child as-

male-       X    Y

female

  X         XX    XY

   X         XX    XY

HENCE THE MALE IS RESPONSIBLE FOR SEX OF CHILD BECAUSE OF DIFFERENT GAMETES

Answer 2

Answer:

Zygote is a diploid cell having 2n chromosomes. Zygote is a very early stage of sex determination and the sex determination can take place at embryo level in practical world. Theoretically for sex determination at zygote level is as follows:

Male is bearer of XY chromosome. Female is bearer of XX chromosome. From this we can understand that female chromosome does not decide the sex of the zygote/offspring. The pairing of male chromosome X with female chromosome X i.e XX pairing will result in female zygote/offspring and male chromosome Y pairing with X chromosome from female i.e XY pairing will result in male zygote/offspring.

               Hope it is helpful to you !!