Evolution — BIOLOGY STD 12 Science — Question

Name the phenomenon that leads to situations like ‘XO’ abnormality in humans. How do humans with ‘XO’ abnormality suffer? Explain.

A childless couple has agreed for a test tube baby programme. List only basic stepsof the procedure that would involve to conceive a baby.

Answer the following questions:

Patients who have undergone myocardial infarction are given clot buster. Mention the clot buster administered and its microbial source.

A colour–blind man marries a woman with normal vision whose father was colour–blind. Work out a cross to show the genotype of the couple and their respective sons.

For producing a recombinant protein (for therapeutic purpose) in large scale, which vector would you choose—a low copy number or high-copy number?

Explain any one use of biotechnology in medicine.

Write briefly the role of pollination in the growth and development in an angiosperm.

In peas, tallness is dominant over dwarfness, and red colour of flower is dominant over the white flower colour. When a tall plant bearing-red flower was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny-in numbers mentioned against them.
Tall, red 138, Tall, white = 132, Dwarf, red = 136, Dwarf, white = 128.
Mention the genotypes of the two parents and of the four offsprings types.

What will be the effect on sperms on removal of prostate and cowper’s glands from man’s body?

How do microbes reduce the environmental degradation caused by chemicals?