Reproductive Health — BIOLOGY STD 12 Science — Question

What happens when chromatids fail to segregate during cell division cycle? Explain your answer with an example.

Differentiate between bioethics and biopatent.

Name any two common Indian millet crops. State one characteristic of millets that has been improved as a result of hybrid breeding so as to produce high yielding millet crops.

Name the respective asexual reproductive structures of Yeast and Sponge.

1. What is a vaccine? Give an example of a vaccine produced by recombinant DNA technology.
2. Name the disease against which DPT vaccine develops immunity?

Name the cells, HIV (Human Immunodeficiency Virus)gains entry into after infecting the human body. Explain the events that occur in these cells.

Distinguish between exonucleases and endonucleases.

Why do some plants have both chasmogamous and cleistogamous flowers?

What is gametogenesis? Write its any three significance.

Which part of the blastula is destinated to form germ layers of the developing embryo in humans?