Question

draw the labelled diagram depicting sex determination in human being​

Answer 1

Answer:

Sex is determined by genetic inheritance in human beings. Genes inherited from parents determine whether the offspring will be girl or boy. There are two sex chromosomes in human beings X and Y chromosome, the male contributes XY chromosomes and females contribute XY chromosome. If a sperm with X chromosome fertilises with an ovum having X chromosome then it will be a girl. If a sperm carrying Y chromosome fertilises with an ovum having X chromosome then it will be a boy.

Answer 2

Sex determination is mainly based on the "sex chromosomes" inherited by the progeny from the parents.

The parents with their sex genotypes are:

• Male : (XY)
• Female : (XX)

The gametes have single sex chromosomes as follows:

• From male parent : X and Y
• From female parent : X and X

Now, the fusion of the gametes can be expressed in the form of a PUNNETT SQUARE as follows:

[tex]\begin{array}{| c | c | c |} \cline{1-3} Gametes & X & Y \\ \cline{1-3} X & XX & XY \\ \cline{1-3} X & XX & XY \\ \cline{1-3} \end{array}[/tex]

Now, whenever a progeny has :

• XX genotype , it is a female.
• XY genotype , it is a male.

There is 50% chance of a male and 50% chance of a female being born.