Which of the following statements are correct?

(i) Polyploidy is caused due to failure of cytokinesis after telophase.

(ii) polyploidy results into increase in number of autosomes

(iii) Turner’s syndrome is an example of polyploidy

(iv) polyploidy results into an increase in a whole set of chromosomes

(1) (i) and (ii)

(2) (i) and (iii)

(3) (ii) and (iii)

(4) (i) and (iv)

Sex determination in Honey bee depends upon-

1. Number of sets of chromosomes present in parents
2. Number of sets of chromosomes present in progenies
3. Number of sets of genes present in progenies
4. Number of sets of genes present in progenies

What is wrong with respect to sex determination in honey bee?

1. Unfertilized egg develops as a male by means of parthenogenesis.
2. Union of sperm and egg develops as a female
3. All workers and males will have 16 chromosomes while queen will have 32 chromosomes.
4. Males produce sperms by mitosis.

What is the special characteristic feature of haplodiploid sex determination?
1. Males produce sperms by mitosis
2. Number of sets of chromosomes present in progenies will decide their sex
3. Workers will have a diploid set of chromosomes.
4. Drones will have a haploid set of chromosomes.

Colour Blindness is ------- due to defect in either----- or---- ------ of eye.

1. Sex-linked recessive disorder, red, orange rods
2. Sex-linked dominant disorder, red, green rods
3. Sex-linked dominant disorder, red orange cones
4. Sex-linked recessive disorder, red , green cones

Which of the following is an autosomal recessive blood disease?

1. Phenylketonuria
2. Thalassemia
3. Haemophilia
4. Muscular dystrophy

Which of the following are correct with respect to Thalassemia?

1. An autosomal dominant disorder
2. Defect due to mutation or deletion
3. Parents will be homozygous for thalassemia
4. Occurs due to vitamin deficiency

Read the following statements with respect to Thalassemia and find the wrong one.

1. Quantitative disorder
2. Different forms of Thalassemia are observed
3. Anaemia is not a characteristic feature of this disease
4. Defect due to mutation and deletion

How sickle cell anaemia is different from Thalassemia?

1. Being autosomal recessive
2. Being a blood disease
3. Being a qualitative disorder
4. Involvement of mutation

The basis of Thalassemia classification can be-

1. Which parent is affected
2. Which chain of haemoglobin molecule is affected
3. How much a chain is affected
4. Which gender is showing the disease