Heredity and Evolution

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Heredity and Evolution - 1

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Q.1. Which of the following is a totally impossible outcome of Mendel’s Experiment (crossbreeding pure bred tall and short pea plants) *

1 point

24 tall and 8 short plants

4 tall plants and 1 medium-height plant.

8 tall and 0 short plants

3 tall 1 short plant

Q.2. Which one of the following is not one of the direct conclusions that can be drawn from Mendel’s experiment? *

1 point

Two copies of each trait is inherited in sexually reproducing orgainsm

Only one parental trait is expressed

Natural selection can alter frequency of an inherited trait.

For recessive trait to be expressed, both copies should be identical.

Q.3. Which one is a possible progeny in F2 generation of pure bred tall plant with roundseed and short plant with wrinkled seeds? *

1 point

Short plant with round seed

Tall plant with round seeds

Tall plant with wrinkled seeds

All of the above

Q.4. A section of DNA providing information for one protein is called— *

1 point

Trait

Nucleus

Gene

Chromosomes

Q.5. Which of the following is controlled by genes? (i) Weight of a person (ii) Height of a person *

1 point

only (ii)

only 1 (i)

Sometimes (i) and sometimes (ii)

both (i) and (ii)

Q.6. Which one of the following is present in the nucleus? *

1 point

All of these

DNA

Gene

Chromosomes

Q.7. Amongst which of the following animals, sex of the offspring not genetically determined? *

1 point

Humans

Dogs

Birds

Snails

Q.8. What is the probability that a human progeny will be a boy? *

1 point

47.34%

50%

56%

It varies

Q.9. Who have a perfect pair of sex chromosomes? *

1 point

Girls only

Both girls and boys

Boys only

It depends on many other factors

Q.10. There is an inbuilt tendency of variation during reproduction because of– (i) Errors in DNA copying (ii) Sexual reproduction *

1 point

only (ii)

both (i) and (ii)

none of them

only (i)

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