Solved MCQs of Biology Class 9
Karyokinesis is division………………… .
Nucleus
Cytoplasm
DNA
proteins
Down’s syndrome is case of ……………… .
Autosomy
Monosomy
Trisomy
Tetrasomy
The Klinefelter’s syndrome males have an extra ……………….. .chromosomes.
Sex
Autosome
Both 1 & b
None
The process of mitosis ensures that:
Each new cell is genetically different from its parent
Each new cell receives the proper number of chromosomes
Cell will divide at the appropriate time
Chromosomes duplicated without errors.
Which of the following distinguishes meiosis from mitosis?
The chromosome number is reduced
Chromosomes undergo crossing over
The daughter cells are genetically different from the parent cell.
All of the above
In which stage of the cell cycle each chromosome is duplicated and so it consists of two chromatids?
GI
S
M
G2
Chromosomes condensation occurs during ………….. .
G1-phase
G2-phase
S-phase
Interphase
During mitosis the number of chromosomes becomes …………… .
Double
Remain same
Becomes Half
None
Males with two Y chromosomes have more ……………… tendensies.
Citizenship
Criminal
Good
None
Two consecutive cell division occurs in …………..
Meiosis
Mitosis
Interphase
None
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