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

(1) They show uniformity.

(2) Controlled by three or more genes

(3) It is not influenced by the environment.

(4) In polygenic inheritance phenotype reflects the contribution of dominant allele only.

Options :

1. 1 and 2

2. 2, 3 and 4

3. 1, 3 and 4

4. only 2

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

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

1. Short stature

2. Gynaecomastia

3. Palm crease

4. Furrowed tongue

Cystic fibrosis, Myotonic dystrophy and Thalassemia are

1. Chromosomal disorders

2. Autosomal recessive disorders

3. Mendelian disorders

4. Autosomal dominant disorders

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%

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

Select the correct option from the following:

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)

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

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

In cases of Phenylketonuria:

1. The affected individual lacks an enzyme that converts the amino acid tyrosine into phenylalanine.

2. The affected individual makes an enzyme that converts the amino acid tyrosine into phenylalanine.

3. The affected individual makes an enzyme that converts the amino acid phenylalanine into tyrosine.

4. The affected individual lacks an enzyme that converts the amino acid phenylalanine into tyrosine.