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Principles of Inheritance and Variation

Multiple Choice Questions

251.

Inheritance of ABO blood groups illustrates

polyploidy
multiple allelism
euploidy
dominance

252.

Crossing over in diploid organisms is responsible for

dominance of genes
linkage between genes
recombination of linked genes
segregation of alleles

253.

First geneticist, father of genetics was

de Vries
Mendel
Darwin
Morgan

254.

'Heterosis' is related to :

cloning
selection
hybridization
introduction

255.

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

256.

Sex determination in humans takes place by

sex chromosomes of father
measurement of sperm
measurement of ovum
sex chromosomes of mother

257.

Turner's syndrome chromosome pattern is:

258.

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

259.
The number of chromosomes in Klinefelter's syndrome are :

47

46

45

44

Klinefelter's syndrome is a chromosomal condition in males that can affect physical and intellectual development. These individuals have 47 chromosomes, i.e. 44 + XXY. Such individuals are sterile with undeveloped testes, sparse body hair, mental retardation, long limbs and some female characters.