Haemophilia is more common in males because it is a ______.

(a)

Recessive character carried by Y-chromosome

(b)

Dominant character carried by Y-chromosome

(c)

Dominant trait carried by X-chromosome

(d)

Recessive trait carried by X-chromosome

Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?

(a)

I^A I^B and I^oI^o

(b)

I^A I^o and I^BI^o

(c)

I^B I^B and I^A I^A

(d)

I^A I^A and I^oI^o

If the childs blood group is ‘O’ and fathers blood group is ‘A’ and mother’s blood group is ‘B’ the genotype of the parents will be ______.

(a)

I^A I^A and I^B I^o

(b)

I^A I^o and I^B I^o

(c)

I^A I^o and I^oI^o

(d)

I^oI^o and I^B I^B

A marriage between a colourblind man and a normal woman produces _______.

(a)

All carrier daughters and normal sons

(b)

50% carrier daughters, 50% normal daughters

(c)

50% colourblind sons, 50% normal sons

(d)

All carrier offsprings

Pataus syndrome is also referred to as ______.

(a)

13-Trisomy

(b)

18-Trisormy

(c)

21-Trisormy

(d)

None of these

Improvement of human race by encouraging the healthy persons to marry early and produce large number of children is called

(a)

Positive eugenics

(b)

Negative eugenics

(c)

Positive euthenics

(d)

Positive euphenics

ZW-ZZ system of sex determination occurs in _____.

(a)

Fishes

(b)

Reptiles

(c)

Birds

(d)

All of these

The__________ is called null allele.

(a)

I^A

(b)

I^OI^B

(c)

I^O

(d)

I^BI^B

The ZW - ZZ type of sex determination is seen ________.

(a)

Butterflies

(b)

Drosophila

(c)

Gypsy moth

(d)

Human being

Depending on position of centromere and relative length of two arms human chromosomes can be classified into ________ type.

(a)

2

(b)

3

(c)

4

(d)

5