Read the following and answer any four questions from (i) to (v).

Sex determination is the method by which distinction between males and females is established in a species. The sex of an individual is determined by specific chromosomes. These chromosomes are called sex chromosomes or allosomes. X and Y chromosomes are called sex chromosomes. The normal chromosomes other than the sex chromosomes of an individual are known as autosomes.

(i) ln XX-XO type of sex determination:

1. Females produce two different types of gametes.
2. Males produce two different types of gametes.
3. Females produce gametes with Y chromosome.
4. Males produce gametes with Y chromosome.

(ii) A couple has six daughters. What is the possibility of their having a girl next time?

1. 10%
2. 50%
3. 90%
4. 100%

(iii) Number of autosomes present in liver cells of a human female is:

1. 22 autosomes.
2. 22 pairs.
3. 23 autosomes.
4. 23 pairs.

(iv) XX-XO type of sex determination and XX-XY type of sex determination are the examples of:

1. Male heterogamety.
2. Female heterogamety.
3. Male homogamety.
4. Both (b) and (c).

(v) Select the incorrect statement.

1. ln male grasshoppers, 50% of sperms have no sex chromosome.
2. Female fruit fly is heterogametic.
3. Human male produces two types of sperms 50% having X chromosome and 50% having Y chromosomes.
4. In turtle, sex determination is regulated by environmental factors.