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 selfed, 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
A. (i) and (ii)

B. (i) and (iv)

C. (ii) and (iii)

D. (i) and (iii)

A trait in an organism is influenced by

Select the group which shares maximum number of common characters

The number of pair (s) of sex chromosomes in the zygote of humans is

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

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

Study the different conclusions drawn by students of a class on the basis observations of preserved/available specimens of plants and animals.

I. Potato and sweet potato are analogous organs in plants.

II. Wings of insects and wings of birds are homologous organs in animals.

III. Wings of insects and wings of bats are analogous organs in animals.

IV. Thorns of citrus and tendrils of cucurbita are analogous organs in plants. The correct conclusions are:

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

A zygote which has inherited an X chromosome from the father will develop into :

(a) E is the gene for brown eye color and e is the gene for blue eye color. Which gene is

(i) Recessive, and

(ii) Dominant

(b) Both father and mother have the genes Ee in their cells. What color are their eyes?

(c) Which combination of genes in the zygote will produce children with blue eyes?

(d) Which combinations of genes in the zygote will produce children with brown eyes?

A pregnant woman has an equal chance of her baby being blood group A or blood group AB. Which one of the following shows the possible genotypes of the woman and the father of her child?