A person with the sex chromosomes XXY suffers from :
Down's syndrome
Turner's syndrome
Gynandromorphism
Klinefelter's syndrome
D.
Klinefelter's syndrome
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.
Down syndrome is also known as Trisomy- 21. It is a genetic disorder caused by the presence of extra copy of chromosome on 21st chromosome.
Turner's syndrome is a chromosomal condition that affects development in females. It consists of only 45 pairs of chromosomes ie, it is represented as X0. Females with this type of disease have short stature.
A gynandromorph can have bilateral asymmetry; one side female and one side male. Alternatively, the distribution of male and female tissue can be more haphazard. Bilateral gynandromorphy arises very early in development, typically when the organism has between 8 and 64 cells.
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
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
