Q1 of 63 Page 162

Differentiate between:


identical twins and fraternal twins

Identical twins are produced from one ovum i.e. one developing zygote splits and grows into two foetuses whereas fraternal twins are produced when two ova get fertilized at a time.


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1

Differentiate between:


impotency and sterility

 1

Differentiate between:


the prostate gland and Cowper’s gland (the nature of secretion)

 2

Name and describe very briefly, the stages in the development of the human embryo.

 3

Describe the functions of

(a) amnion


(b) placenta