Q29 of 167 Page 192

In a human, how many chromosomes are present in:

(a) a brain cell ?


(b) a sperm in the testes ?


(c) an egg which has just been produced by the ovary?


(d) a skin cell ?


(e) a fertilized egg ?

(a) 46 (23 pairs of chromosome)

(b) 23 chromosomes (haploid)


(c) 23 chromosomes (haploid)


(d) 46 chromosomes (23 pairs of chromosome)


(e) 46 chromosomes (since it is fertilized by the sperm)


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Gregor Mendel's first law of genetics states "Of a pair of contrasted characters, only one can be represented in a gamete by its internal 'factor'.

(a) Give the modem name for this 'factor'.


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