Q3 of 32 Page 32

Name any two genetic diseases in humans.

Colour-blindness and sickle cell anaemia are two genetic diseases in humans.


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1

Match the terms in column I with their explanations in column II.



























Column I


(Term)



Column II


(Explanation)



a. Genetics



(i) Chromosomes similar in size and shape



b. Autosomes



(ii) The alternative forms of a gene



c. Recessive gene



(iii) Study of laws of inheritance of characters



d. Allele



(iv) A gene that can express only when in a similar pair



e. Homologous Chromosomes



(v) Chromosomes other than the pair of sex chromosomes.


 2

Name two animals which have nineteen pairs of chromosomes.

 4

Which one of the following genotypes is homozygous dominant and which one homozygous recessive in regard to tongue rolling: Rr, IT, RR

 1

Differentiate between:

genotype and phenotype.