Question

1. Mutations in BRCA1 and BRCA2 appear to be inherited and cause most cases of breast cancer in women.

True

False

2. Reproductive cloning may be used to induce the production of organs in pigs for transplant into humans.

True

False

3. In a female tortoiseshell cat, some x chromosomes are active in some cells and the other x chromosome is active in other cells producing a pattern of different colors.

True

False

4. In female animals both X chromosomes are active or expressed in all cells.

True

False

Answer 1

1) True

BRCA1 and BRCA2 mutation is responsible for DNA repairing. If mutation is found in these genes then there will be breast cancer in women.

2) True

Reproductive cloning has following importance:

* it is used for producing transgenic organism which has desired gene of interest in it.

*it restocks the endangered population

* it is also used to induce the production of organ in pigs for transplant into human.

3) True.

b​​​​​​ecause of inactivation of different X chromosome in cell. There is found different combination in somatic cells which give rise to different color in the tortoise cat.

4) False

In female mammals, X chromosome inactivation occur in somatic cell. This leads to formation of barr body.