Heredity and Evolution
Human baby will be a male if its 23rd chromosome pair is:
XX
XY
X
XXX
XY
Humans contain 22 pairs of autosomes and 1 pair of sex chromosomes. The female gamete or the egg consists of an โXโ chromosome. If this is fertilised by a sperm containing โXโ chromosome, the baby will have โXXโ chromosome and will be a female. But if the egg is fertilised by a sperm containing โYโ chromosome, the baby will have โXYโ chromosome and will be a male.
XY Humans contain 22 pairs of autosomes and 1 pair of sex chromosomes. The female gamete or the egg consists of an โXโ chromosome. If this is fertilised by a sperm containing โXโ chromosome, the baby will have โXXโ chromosome and will be a female. But if the egg is fertilised by a sperm containing โYโ chromosome, the baby will have โXYโ chromosome and will be a male.
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Human cells have ______ pair(s) of autosomes.A. 23
B. 2
C. 22
D. 1
According to fossil discovered up to present time, the origin and evolution of man started from:
A. France
B. Java
C. Africa
D. China
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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