Q1 of 32 Page 32

Which one of the following has the smallest number of chromosomes?

Ascaris has only two chromosomes while onion has 16, the mouse has 40 and Monkey has 54 chromosomes.

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3

Define the following terms:

(i) Monohybrid ………………………


(ii) Dihybrid ……………………………


(iii) Filial generation …………………

 4

List any four traits in humans which you can easily study just by observing and making

Family charts.


(i) …………………………… (ii) ………………………………………


(iii) ………………………… (iv) ………………………………………

 2

Which one of the following is the phenotypic monohybrid ratio in an F2 generation?

 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.