Q23 of 167 Page 192

Explain how, sex is determined in human babies.

The unfertilized egg has one X chromosome. The sperm either has a X chromosome or a Y chromosome. If sperm carrying Y chromosome fertilizes with the egg, male baby will be born with the genetic constitution XY. But if sperm carrying X chromosome fertilized with the egg, female baby will be born with the genetic constitution XX.


More from this chapter

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22

State one advantage of variation to a species.

 22

What are sex chromosomes? How many sex chromosomes are there? Name them.

 24

What do the following symbols used in the topic on heredity represent?

(a) TT (b) tt


(c) XX (d) XY

 25

What will you get in the F1 and F2 generations in the following cross ? Pure tall pea plant x pure dwarf pea plant?