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Exchange of genetic material takes place in
Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be
A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because
Which of the following statement is incorrect?
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
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
The maleness of a child is determined by
A zygote which has an X-chromosome inherited from the father will develop into a
Select the incorrect statement
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 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 basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?
Select the correct statement
If the fossil of an organism is found in the deeper layers of earth, then we can predict that
Which of the following statements is not true with respect to variation?
A trait in an organism is influenced by
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
The number of pair (s) of sex chromosomes in the zygote of humans is
The theory of evolution of species by natural selection was given by
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
