Heredity and Evolution Test - 5

The maleness of a child is determined by

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

Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round yellow (RrYy) seeds. When F₁ plants are self-pollinated, the F₂ progeny will have new combination of characters. Choose the new combination from the following

(i) Round, yellow

(ii) Round, green

(iii) Wrinkled, yellow

(iv) Wrinkled, green

If the fossil of an organism is found in the deeper layers of earth, then we can predict that

Select the group which shares maximum number of common characters.

According to the evolutionary theory, formation of a new species is generally due to

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

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

Select the statements that describe characteristics of genes

(i) genes are specific sequence of bases in 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

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