1.
In human males all the chromosomes are paired perfectly except one. This/These unpaired chromosome is/are: (i) Large chromosome (ii) Small chromosome (iii) Y-chromosome (iv) X-chromosome
2.
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be:
3.
Which of the following statement is incorrect?
4.
A zygote which has an X-chromosome inherited from the father will develop into a
5.
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 F_{1} plants are selfed, the progeny will have new combination from the following: F2 (i) Round, yellow (ii) Round, green (iii) Wrinkled, yellow (iv) Wrinkled, green
6.
A trait in an organisms is influenced by:
7.
Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that:
8.
Select the incorrect statement:
9.
The number of pairs(s) of sex chromosomes in the zygote of human is:
10.
If the fossil of an organism is found in the deeper layers of earth, then we can predict that:
11.
The two versions of a trait (character) which are brought in by the male and female gametes are situated on:
12.
Select the group which shares maximum number of Common characters:
13.
From the list given below, select the character which can be acquired but not inherited:
14.
If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in F1 generation are:
15.
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
16.
According to the evolutionary theory, formation of a new species is generally due to:
17.
The theory of evolution of species by natural selection was given by:
18.
Select the correct statement.
19.
A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because:
20.
Exchange of genetic material takes place in:
21.
The maleness of a child is determined by:
22.
A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?
23.
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
24.
In peas a pure tall plants (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plant in F2 is
25.
Which of the following statements is not true with respect to variation?
