Reproductive Health — BIOLOGY STD 12 Science — Question

With an example explain lattitude gradient, as a pattern of biodiversity.

Mention the charateristics of the first ape man Australopithecus africanus.

Why is haemophilia rare in human females? Mention a clinical symptom of the disease.

How does the study of different parts of a flower help in identifying in wind as its pollinating agent?

Name the cell from which the endosperm develops in a coconut. Mention its ploidy. Explain the process of endosperm development in a coconut.

When Morgan conducted a dihybrid cross on Drosophila like Mendel did with pea plants, the F, ratios deviated significantly from that of Mendels F, ratio. Write the explanation Morgan and his group gave for the observations they obtained from their experiments.

Or

Morgan carried out several dihybrid crosses in Drosophila and found F, ratios deviated very significantly from the expected Mendelian ratio. Explain his findings with the help of an example.

What is microsporogenesis? Where does it occur in angiosperms? What is its significance?

What essential features must be present in a cloning vehicle/ cloning vector?

Differentiate between T-helper cells and T-killer cells.

Consult internet and find out how to make orally active protein pharmaceutical. What is the major problem to be encountered?