251.

Inheritance of ABO blood groups illustrates

• polyploidy

• multiple allelism

• euploidy

• dominance

Crossing over in diploid organisms is responsible for

• dominance of genes

• linkage between genes

• recombination of linked genes

• segregation of alleles

First geneticist, father of genetics was

• de Vries

• Mendel

• Darwin

• Morgan

'Heterosis' is related to :

• cloning

• selection

• hybridization

• introduction

When a tall plant with rounded seeds (TTRR) is crossed with a dwarf plant with wrinkled seeds (ttrr), the F₁ generation consists of tall plants with rounded seeds. How many types of gametes an F₁ plant would produce ?

• One

• Three

• Four

• Eight

Sex determination in humans takes place by

• sex chromosomes of father

• measurement of sperm

• measurement of ovum

• sex chromosomes of mother

Turner's syndrome chromosome pattern is:

• XO

• XXX

• XYY

• XXY

The main cause of Edward syndrome, Patau syndrome and Down syndrome is :

• mutation of gene

• change in both autosomes and heterosomes

• change in autosomes

• change in heterosomes

The number of chromosomes in Klinefelter's syndrome are :

• 47

• 46

• 45

• 44

The genotype of a man having female sexual characters will be :

• XXY

• XYY

• XO

• XXX