Question 3 :
<b><span>Study the statements given below.<br/>X: In humans, the gamete contributed by the male determines whether the child produced will be male or female.</span></b><div><b><span>Y: Sex in humans is a polygenic trait depending upon a&#160;cumulative effect of some genes on&#160;X chromosome&#160;and some on&#160;Y chromosome.</span></b></div>

Question 7 :
In human beings, sex determination has recently been studied in great details using technique of molecular biology. The most important gene located on Y chromosome and involved in sex determinations is?

Question 11 :
If there were only parental combinations in F$_2$ of a dihybrid cross then Mendel might have discovered

Question 14 :
When synapsis is complete all along the chromosome, the cell is said to have entered a stage called as