Heredity and Evolution
Human cells have ______ pair(s) of autosomes.
23
2
22
1
22
Humans have a total of 23 pairs of chromosomes, out of which 22 pairs are autosomes and 1 pair has sex chromosomes.
The members of the autosomal pairs are homologous i.e., they are similar in shape and organisation.
On the other hand, sex chomosomes or allosomes may be heterologous (in males) or homologous (in females).
22 Humans have a total of 23 pairs of chromosomes, out of which 22 pairs are autosomes and 1 pair has sex chromosomes.
The members of the autosomal pairs are homologous i.e., they are similar in shape and organisation.
On the other hand, sex chomosomes or allosomes may be heterologous (in males) or homologous (in females).
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According to fossil discovered up to present time, the origin and evolution of man started from:A. France
B. Java
C. Africa
D. China
Human baby will be a male if its 23rd chromosome pair is:
A. XX
B. XY
C. X
D. XXX
The evolution of vegetable broccoli belonging to the cabbage family is an example of:
A. natural selection
B. artificial selection
C. elimination
D. speciation
The figure below depicts a situation where a rare variation has become common. The green coloured beetle population has become common because it gave them a survival advantage. This is an example of:
A. Artificial selection
B. Natural selection
C. Accidental selection
D. Random selection
In evolutionary terms, we have more in common with a:
A. monkey
B. rat
C. chimpanzee
D. gorilla
The preserved traces of living organisms are known as:
A. Humus
B. Crust
C. Skeleton
D. Fossils
Speciation may take place when _______ is/are combined with geographical isolation.
A. variations
B. genetic engineering
C. cloning
D. duplication
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