What is the process by which characters are passed on from parent to progeny?
Inheritance is defined as the process by which characters are passed on from parent to progeny and is the basis of heredity.
Question 2 of 519
📘 CLASS XII
For how many years did Gregor Mendel conduct his hybridisation experiments on garden peas?
Gregor Mendel conducted hybridisation experiments on garden peas for seven years, from 1856 to 1863, and subsequently proposed the laws of inheritance in living organisms.
Question 3 of 519
📘 CLASS XII
What was a novel approach used by Mendel in his investigations into inheritance patterns for the first time in biology?
During Mendel’s investigations, it was the first time that statistical analysis and mathematical logic were applied to problems in biology. This, along with a large sampling size, gave his data greater credibility.
Question 4 of 519
📘 CLASS XII
A true-breeding line is one that:
A true-breeding line is defined as one that, having undergone continuous self-pollination, shows stable trait inheritance and expression for several generations. Mendel selected 14 such true-breeding pea plant varieties.
Question 5 of 519
📘 CLASS XII
Which of the following is NOT one of the seven contrasting traits studied by Mendel in pea plants?
Mendel studied seven pairs of contrasting traits: Stem height, Flower colour, Flower position, Pod shape, Pod colour, Seed shape, and Seed colour. Leaf shape was not among them.
Question 6 of 519
📘 CLASS XII
In Mendel's dihybrid cross between a plant with yellow round seeds and one with green wrinkled seeds, what was the phenotype of the F1 generation?
Mendel found that the seeds resulting from the crossing of the parents had yellow coloured and round shaped seeds. This is because yellow colour was dominant over green and round shape was dominant over wrinkled.
Question 7 of 519
📘 CLASS XII
What is the phenotypic ratio observed in the F2 generation of a dihybrid cross conducted by Mendel?
In the F2 generation of a dihybrid cross, the phenotypes round, yellow; wrinkled, yellow; round, green; and wrinkled, green appeared in the ratio 9:3:3:1.
Question 8 of 519
📘 CLASS XII
Mendel's Law of Independent Assortment is based on observations from:
Based upon observations on dihybrid crosses, which are crosses between plants differing in two traits, Mendel proposed the Law of Independent Assortment.
Question 9 of 519
📘 CLASS XII
The Law of Independent Assortment states that:
The law states that ‘when two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters’.
Question 10 of 519
📘 CLASS XII
Which of the following was NOT a reason for Mendel's work remaining unrecognised until 1900?
Mendel's work remained unrecognised for several reasons, including: poor communication which meant his work could not be widely publicised; his concept of stable, discrete genes that did not blend was not accepted; and his mathematical approach was new and unacceptable to many biologists of his time.
