Which of the following represents Klinefelter's syndrome?
XX
XO
XY
XXY
D.
XXY
Klinefelter's syndrome is a chromosomal abnormality due to which an individual has two X-chromosomes and one Y-chromosome ie, XXY. Such persons are sterile male and may exhibit secondary female characters. They also have underdeveloped genitalia, sparse body hair and exhibit some degree of breast development. They possess 47 chromosomes instead of normal 46 chromosomes. The interphase nuclei of their cells possess one barr body.
The phase of menstrual cycle in humans that lasts for 7-8 days, is :
menstruation
luteal phase
ovulatory phase
follicular phase
Which one of the following statement with regard to the embryonic development in humans is correct ?
Cleavage results in a hollow balls of cells called morula
Cleavage in mammalian ova is unequal holoblastic and horizontal
Rearrangement of blastomeres, a central cavity is formed inside the morula
Cleavage bring about considerable increase in the mass of protoplasm
Which of the following is not immunised by triple antigen ?
Typhoid
Tetanus
Diptheria
Whooping cough
A person with the sex chromosomes XXY suffers from :
Down's syndrome
Turner's syndrome
Gynandromorphism
Klinefelter's syndrome
Reproducing new plants by cells, instead of seeds, is known as :
Mutation
antibiotics
biofertilizer
tissue culture
Which of the following insecticide is obtained from the roots of Derris elliptica ?
Cinerin
Nicotine
Rotenone
Pyrethrum
