Science M.C.Q

A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as...

What is formed in independently inherited traits when plants showing different characteristics are bred?

By what is a trait in an organism influenced?

Statement A : All children will inherit an X-chromosome from their mother.
Reason R : Women have a perfect pair of both X-sex chromosome.
Which is correct option for Statement A and Reason R?

A snail can change its sex. What does it indicate?

Which of the following statement is true for variation in organisms?
(1) The occurrence of differences among the individuals of the same species is known as variation.
(2) Variations decrease the possibilities of survival.
(3) Variation is generated due to major inaccuracies in DNA copying.
(4) During meiosis, crossing over takes place between the genes and hence, new combinations are formed, which ultimately results in producing variations.

Hybridazation experiment performed by Mendel between a tall (TT) plant and a dwarf (tt) plant of Pisum sativum gave the following result in F₂ generation ......... .

Which of the following is an inherited trait?

How many sex chromosomes are found in the reproductive cells (gametes) of human being?

How many pairs of sex chromosomes are found in the somatic cells of the human being?

Which is the function of gene?

The Y-chromosome in human male ___________.

How many types of sperms are found in man?

In the result of Mendel's experiment on the inheritance of two characters, the ratio of the plants showing yellow and wrinkled seeds and of the plants showing green and round seeds in F₂ generation is ........... .

Which factor conducts the expressive genetic information from one generation to another?

Which scientist was the first to conduct systematic experiments for the study of heredity?

Statement X : In human beings, the sex determination of a child depends on genetic inheritance.
Statement Y : In snail, the process of sex determination is not genetically determined.
What is the correct option for statements X and Y?

Which is a false statement for variation?

Study following statements (P to R) and choose the correct alternative :
P : In higher organisms, each cell will have two copies of each chromosome.
Q : In sexually reproducing organisms, the rules of inheritance are followed.
R : In asexually reproducing organisms, the rules of inheritance are followed.

When hybridisation is carried out between a tall (TT) pea plant and a short (tt) pea plant, all the plants (offsprings) show the expression of tallness, because …..

In which of the following, the new combinations of genes formed ?