Q2 of 32 Page 32

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

When a pure breeding with black fur (TT) animal species crossed with a pure-breeding with brown fur (tt) animal species, the offsprings are obtained as follows in F1 and F2 generation.


Thus, in F2 generation;


Genotype = 1:2:1


Phenotype = 3:1

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4

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

Family charts.


(i) …………………………… (ii) ………………………………………


(iii) ………………………… (iv) ………………………………………

 1

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

 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.