Among human males _______ chromosome is present but its counterpart is _____ and called ______ chromosome.

(1) Y, bigger, Z

(2) X, smaller, Z

(3) X, smaller, Y

(4) Z, bigger, X

In which of the following male heterogamety is not observed?

(1) Insects

(2) Birds

(3) Humans

(4) (1) and (2)

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)

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.

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

(1) Fragmentation

(2) Budding

(3) Amitosis

(4) mutation

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%

In ABO blood grouping how many genotypes show co-dominance? 

(1) 1

(2) 2

(3) 3

(4) 4

Pedigree analysis is not utilized to trace

(1) Specific trait

(2) Sex ratio

(3) Disease

(4) Abnormality

In the given pedigree chart select the correct statement:

(1) A & B are twins

(2) A is younger than B

(3) B is younger than A

(4) Can’t determine the age of A & B

Myotonic dystrophy is

(1) Autosomal recessive trait

(2) Autosomal dominant trait

(3) X- linkeddominant trait

(4) X- linked recessive trait