Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

Name any six venereal diseases.

The word hormone is a misnomer.

Study the given pedigree chart and answer the questions that follow:
Is the trait sex–linked or autosomal?

1. Sickel-cell anaemia in humans is a result of point mutation. Explain.
2. Write the genotypes of both the parents who have produced a sickle-cell anaemic offspring.

State the contribution of Louis Pasteur in understanding the origin of life on earth. Explain the procedure that he followed to arrive at his conclusion.

The cytological observations made in a number of insects led to the development of the concept of genetic/ chromosomal basis of sex-determination mechanism. Honey bee is an interesting example to study the mechanism of sex-determination. Study the schematic cross between the male and the female honey bees given below and answer the questions that follow:

1. Identify the cell divisions ‘A’ and ‘B’ that lead to gamete formation in female and male honey bees respectively.
2. Name the process ‘C’ that leads to the development of male honey bee (drone).

Give functions : Spinal cord.

Recombinant DNA technology is of great importance in the field of medicine. With the help of a flow chart, show how this techonolgy has been used in preparing genetically engineered human insulins.

Rohan saw Mr. Sharma collecting different plant specimens. He was confused to see him doing this collection and approached him asking about it.
Mr. Sharma told him that he will cross different plant specimens in his laboratory for obtaining better varieties of plants.

1. Why is he interested in such experiments?
2. Name this technique.
3. What precautions he should take while applying this technique?
4. What values are shown by Rohan?

Define ‘genomics’. Give any ‘two’ applications of it.