In which of the following one may observe variation in DNA?

(1) Fragmentation

(2) Budding

(3) Amitosis

(4) mutation

Sickle cell anaemia is a classic example of

(1) Point mutation

(2) silent mutation

(3) Frame shift mutation

(4) non sense mutation

Which of the following statement is correct with respect to human sex determination?

(1) The genetic makeup of egg determines the sex of child.

(2) Female produces two types of ovums and males produce only one type of sperm.

(3) Each pregnancy has more probability of male child than of female.

(4) Out of 23 pairs of chromosomes, 22 are same both in males and females.

If the female has three boys in her first three pregnancy. What are the chances of getting female child this time?

(1) 25%

(2) 50%

(3) 75%

(4) 20%

Which of the following matches is wrong?

(1) Birds- ZZ(male)- ZW(female)

(2) Drosophila- XY(male)- XX(female)

(3) Humans- XY (male), XX (female)

(4) Cockroach- - XZ(male)- ZZ(female)

Mutation causes

(1) alterations at protein level

(2) changes in genotype only

(3) changes in phenotype

(4) both (2) and (3)

In which of the following female heterogamety is not observed?

(1) Insects

(2) Birds

(3) Humans

(4) (1) and (3)

If a haemophilic female who marries a normal male gives birth to a male child, then what are the chances of boy being normal? (a hypothetical situation but it won’t happen practically)

 (1) 0%

 (2) 50 %

 (3) 25%

 (4) 75%

If a normal female has a sickle cell anaemic child what can be the probable genotype of that gene in that female?

(1) AA

(2) aa

(3) Aa

(4) both (1) and (3)