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 Multiple Choice QuestionsMultiple 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


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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


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257.

Turner's syndrome chromosome pattern is:

  • XO

  • XXX

  • XYY

  • XXY


A.

XO

Turner's Syndrome is a chromosomal condition that mainly affects development in females. It is a monosomic condition with 44 + XO genotype. It occurs by the union of an abnormal egg and normal sperm or vice versa. These are sterile females with rudimentary ovaries, underdeveloped breasts, small uterus, short stature and mental retardation.


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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


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259.

The number of chromosomes in Klinefelter's syndrome are :

  • 47

  • 46

  • 45

  • 44


260.

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

  • XXY

  • XYY

  • XO

  • XXX


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