A normal woman, whose father had colour blindness, married a normal man. What is the chance of occurrence of colour blindness in the progeny?

1. 25%

2. 50%

3. 100%

4. 74%

Select the correct answer

In a marriage between a male with blood group A and a female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of the parents?

1. I^A i (Male) ; I^B I^B (Female)

2. I^A I^A (Male) ; I^B I^B (Female)

3. I^A I^A (Male) ; I^B i (Female)

4. I^A i (Male) ; I^B i(Female)

Cystic fibrosis, Myotonic dystrophy and Thalassemia are

1. Chromosomal disorders

2. Autosomal recessive disorders

3. Mendelian disorders

4. Autosomal dominant disorders

All are the characteristics of an individual from trisomy
of chromosome 21, except

1. Short stature

2. Gynaecomastia

3. Palm crease

4. Furrowed tongue

A person with Down syndrome will show all the given
symptoms except

1. Many loops on finger tips.
2. Flat back of head
3. Big and wrinkled tongue
4. Narrow round face

Choose the correct statement about recombination and linkage

1. Complete linkage results in higher non-parental gene combinations than parental type

2. Recombination results in the generation of parental gene combinations

3. Genetic maps are constructed by using the frequency of recombination between gene pairs

4. T.H. Morgan constructed the first chromosome map

How many of the following statements is/are correct for a polygenic inheritance?

Options :
1. 1 and 2
2. 2, 3 and 4
3. 1, 3 and 4
4. only 2

Which of the following is not a hereditary disease?

1. Haemophilia. 

2. Cretinism. 

3. Cystic fibrosis. 

4. Thalassemia.

Monosomy means:
1. Lack of one pair of chromosomes
2. Lack of one of any one pair of chromosome
3. Presence of an extra chromosome
4. Presence of an extra set of chromosomes