In humans, the mechanism of sex determination is:

Which of the following statement is correct with respect to human sex determination?

(1) The genetic makeup of egg determines the sex of child.

(2) Female produces two types of ovums and males produce only one type of sperm.

(3) Each pregnancy has more probability of male child than of female.

(4) Out of 23 pairs of chromosomes, 22 are same both in males and females.

The number of autosomes in a human egg would be:

Males produce two types of gametes in

1. Butterflies

2. Birds

3. Drosophila

4. Moth

Which of the following pair is wrongly matched?

1.  Factors   -   Discrete units

2.  Multiple alleles  -  ABO blood group

3.  Female Drosophila  -  Heterogametic

4.  Inborn error   -   Phenylketonuria

Select the incorrect statement:

Read the following four statements (A-D)

A.  The characters never blend in heterozygous condition.

B.  Change in a single base pair of DNA does not cause mutation.

C.  Cancer cells commonly show chromosomal aberrations.

D.  In chicken, sex chromosomes in males are ZW and in females are ZZ.

How many of the above statements is/are right?

1.  Two

2.  Three

3.  Four

4.  One 

Males are heterogametic and females are homogametic in

1.  Human beings and birds

2.  Fruit fly and butter fly

3.  Grasshopper and cockroach

4.  Birds and silkworm 

Match the items of Column - I with Column - II :

Select the correct option from the following: