Down's syndrome is due to
A. chromosome number increase in 21st pair autosome
B. chromosome number decreases in 21st pair autosome
C. chromosome number increases in 18th pair autosome
D. chromosome number decreases in 18th pair autosome
Answer: Option A
This Question Belongs to Biology GK Chapter Wise >> Gentics And Evoloution
Related Questions on Gentics and Evoloution
A piece of DNA molecule that can serve as a carrier for the gene to be cloned is called as a
A. Virus
B. Vector
C. DNA junk
D. Gene factor
A haploid organism contains only one set of chromosomes, and is said to be
A. Homozygous
B. Heterozygous
C. Hemizygous
D. Holozygous
Which of the following is the correct pair?
A. Darwin - Use and disuse of organs
B. de Vries - Mutation theory
C. Lamarck - Origin of life
D. Haldane - Law of heredity
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