Human Health and Diseases — BIOLOGY STD 12 Science — Question

What does the term genetic diversity refer to? What is the significance of large genetic diversity in a population?

How does tobacco smoking lead to oxygen deficiency in human body?

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

Name the hormones involved in regulation of spermatogenesis.

Briefly explain recombinant DNA technology.

In which way has the study of biology helped us to control infectious diseases?

Why is the rate of assimilation of energy at the herbivore level called secondary productivity?

Why are some molecules called bioactive molecules? Give two examples of such molecules.

Prior to industrialisation, there were far more white winged moths on trees than melanised moths in England. However, after industrialisation, the distribution pattern of these two kinds of moths reversed what does the above observation indicate? Explain giving reasons.

Mention the steps of Isolate DNA from bacteria.