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

ABO blood group in man is controlled by _____.

(a)

Multiple alleles

(b)

Lethal genes

(c)

Sex linked genes

(d)

Y-linked genes

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

Which of the following is not correct?

(a)

Three or more alleles of a trait in the population are called multiple alleles

(b)

A normal gene undergoes mutations to form many alleles

(c)

Multiple alleles map at different loci of a chromosome

(d)

A diploid organism has only two alleles out of many in the population

Which of the following phenotypes in the progeny are possible from the parental combination AxB?

(a)

A and B only

(b)

A,B and AB only

(c)

AB only

(d)

A, B, AB and O

Which of the following phenotypes is not possible in the progeny of the parental genotypic combination I^AI^O x I^AI^B?

(a)

AB

(b)

O

(c)

A

(d)

B

Which of the following is true about Rh factor in the offspring of a parental combination DdxDd (both Rh positive)?

(a)

All will be Rh-positive

(b)

Half will be Rh positive

(c)

About ¾ will be Rh negative

(d)

About one fourth will be Rh negative

What can be the blood group of offspring when both parents have AB blood group?

(a)

AB only

(b)

A, B and AB

(c)

A, B, AB and O

(d)

A and B only

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

XO type of sex determination and XY type of sex determination are examples of ______.

(a)

Male heterogamety

(b)

Female heterogamety

(c)

Male homogamety

(d)

Both (b) and (c)

In an accident there is great loss of blood and there is no time to analyse the blood group which blood can be safely transferred?

(a)

O and Rh negative

(b)

O and Rh positive

(c)

B and Rh negative

(d)

AB and Rh positive

Father of a child is colourblind and mother is carrier for colourblindness, the probability of the child being colourblind is _____.

(a)

25%

(b)

50%

(c)

100%

(d)

75%

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

Down's syndrome is a genetic disorder which is caused by the presence of an extra chromosome number _____.

(a)

20

(b)

21

(c)

4

(d)

23

Klinefelters syndrome is characterized by a karyotype of ____.

(a)

XYY

(b)

XO

(c)

XXX

(d)

XXY

Females with Turners syndrome have ______.

(a)

Small uterus

(b)

Rudimentary ovaries

(c)

Underdeveloped breasts

(d)

All of these

Pataus syndrome is also referred to as ______.

(a)

13-Trisomy

(b)

18-Trisormy

(c)

21-Trisormy

(d)

None of these

Who is the founder of Modern Eugenics movement?

(a)

Mendel

(b)

Darwin

(c)

Francis Galton

(d)

Karl pearson

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

The _______deals with the control of several inherited human diseases especially inborn errors of metabolism

(a)

Euphenics

(b)

Eugenics

(c)

Euthenics

(d)

All of these

“Universal Donor” and “Universal Recipients” blood group are _____and_______respectively

(a)

AB, O

(b)

O, AB

(c)

A, B

(d)

B, A

ZW-ZZ system of sex determination occurs in _____.

(a)

Fishes

(b)

Reptiles

(c)

Birds

(d)

All of these

Co-dominant blood group is ______.

(a)

A

(b)

AB

(c)

B

(d)

O

Which of the following is incorrect regarding ZW-ZZ type of sex determination?

(a)

It occurs in birds and some reptiles

(b)

Females are homogametic and males are heterogametic

(c)

Male produce one type of gamete

(d)

It occurs in gypsy moth