Human Reproduction — BIOLOGY STD 12 Science — Question

Draw a neat diagram of the female reproductive system and label the parts associated with the following (a) production of gamete, (b) site of fertilisation (c) site of implantation and, (d) birth canal.

Enumerate the salient features of human genome.

Explain the steps involved in the elongation of polypeptide chain during its synthesis.

Match the items in Column I with those in Column II.

S.No	Column I	S.No	Column II
A.	ABO blood group in humans	1.	Polygenic inheritance
B.	Flower colour in snapdragon	2.	Mendelian genetic disorder
C.	Human skin colour	3.	Sex-linked Mendelian disorder
D.	Phenylketonuria	4.	Incomplete dominance
		5.	Multiple allelism

Draw and explain a logistic curve for a population of density (N) at time (t) whose intrinsic rate of natural increase is (r) and carrying capacity is (k).

A flower of tomato plant following the process of sexual reproduction produce 240 viable seeds.
Answer the following questions giving reasons:
How many megaspore mother cells were involved?

Write the conclusions Mendel arrived at on dominance of traits on the basis of monohybrid crosses that he carried out in pea plants.

In which categories have been classified the contraceptive methods. Describe any three methods in detail.

Answer the following questions:
Explain how recombinants and non-recombinants are differentiated on the basis of colour production in the presence of a chromogenic substrate. Name that procedure.

Answer the following questions:
Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.