Q7 of 55 Page 247

The two versions of a trait (character) which are brought in by the male and female gametes are situated on:

Copies of same chromosome from the male and female gametes pair up to form a chromosomal pair or gene which combines the two versions of a trait from both the parents, so as to create a new version of the character in the child.

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5

New species may be formed if:

(i) DNA undergoes significant changes in germ cells


(ii) chromosome number changes in the gamete


(iii) there is no change in the genetic material


(iv) mating does not take place

 6

From the list given below, select the character which can be acquired but not inherited:

 8

Select the statements that describe characteristics of genes:

(i) genes are specific sequence of bases n a DNA molecule


(ii) a gene does not code for proteins


(iii) in individuals of a given species, a specific gene is located on a particular chromosome


(iv) each chromosome has only one gene

 9

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is: