Q1 of 32 Page 27

Approximately, how many genes have been Discovered in humans?

The unit of heredity transmitted from one generation to next are called genes. Genes occur on chromosome and they go wherever chromosomes go. According to the latest findings there are 30,000 genes in the humans.

Note: This was discovered in an international research named Human Genome Project which started in 1990 and was completed in 2003.


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1

Mention the following :

(i) Total number of pairs of chromosomes in each body cell in humans ………………………


(ii) Any two animals having 19 pairs of chromosomes …………………………


(iii) Number of pairs of autosomes in humans ……………………………

 2

A certain couple got only four daughters in a row and no son. Does it mean that the husband does not produce Y-bearing sperms? Explain

 2

Define the following terms:

(i) Allele …………………………………


(ii) Dominant gene ………………………


(iii) Genotype ………………………………..


(iv) Phenotype ……………………………


(v) Heterozygous dominant ……………………

 3

Can there be a heterozygous recessive? Explain.