Mock Test – Heredity

1. 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

2. A monohybrid cross is conducted between one variety of pea plants having pods that are full (FF) and another having pods that are constricted (ff). What is the percentage of heterozygous offsprings in F_l generation?

3. A cross between pea plant with white flowers (vv) and pea plant with violet flowers (VV) resulted in F₂ progeny in which ratio of violet (VV) and white (vv) flowers will be:

4. What is the difference between genetic drift and change due to natural selection?

5. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Human, frog and bird have a common ancestor.
Reason: Limbs of human, bird and frog are homologous.

6. Which concept was not included in Charles Darwin’s theory of Natural Selection?

7. The fossil remains of Archaeopteryx is a connecting link between

8. The more characteristics two species have in common :

9. Two individuals are as shown using geometric shapes.

Their sex chromosomes are respectively denoted by X^f, X^m and Y. What are the possible combinations of sex chromosomes for their male and female offspring respectively?

10. Differences between organisms in a species are described as variation. Which of the following would you describe as continuous variation?

11. The maleness of a child is determined by

12. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Speciation is the reproductive isolation amongst once inter breeding population.
Reason: Genetic drift, Natural selection and Severe DNA change can cause speciation.

13. Wild cabbage has evolved into new varieties like cabbage, broccoli and cauliflower by

14. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Variation is beneficial to species.

Reason: Variation enables a species for its survival.

15. Humans have two different sex chromosomes, X and Y. Based on Mendel’s laws; a male offspring will inherit which combination of chromosomes?

16. If a tall pea plant is crossed with a pure dwarf pea plant then, what percentage of F₁ and F₂ generation respectively will be tall?

17. Attached earlobes in humans is an inherited condition. The allele for attached earlobes is recessive. What are the chances of parents, both having attached earlobes, to have a child with attached earlobes?

18. Human offspring’s sex is determined

19. A trait of an organism is influenced by

20. To study the natural phenomenon of inheritance, Mendel selected the pea plants. Which of the following properties were suitable for their studies?
(i) Plants would easily self pollinate or cross pollinate in nature.
(ii) Plants were easily grown in garden soil with a considerably shorter generation time.
(iii) Pea plants do not require the true-breeding for hybridisation experiments.
(iv) Many parts of the plant such as pod, seed, flower, cotyledons showed distinct phenotypes.

21. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Height in pea plants is controlled by efficiency of enzymes and is thus genetically controlled.

Reason: Cellular DNA is the information source for making proteins in the cell.

22. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Each and every child has two versions of DNA-both paternal and maternal.

Reason: Both the father and the mother contribute equal amounts of genetic materials to their child.

23. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Acquired trait cannot be passed on from one generation to next generation.
Reason: Inaccuracy during DNA copying of acquired trait is minimum.

24. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: When pure breed tall plants are crossed with pure breed short plants, all the plants in F₁ progeny are tall. When the tall plants of F₁ progeny are crossed, short plants re-appear in F₂ progeny.
Reason: Traits are independently inherited.

25. A zygote which has an X-chromosome inherited from the father will develop into a

26. Which of the following is an example of genetic variation?

27. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: In human beings, males produce similar gametes.

Reason: Males have a pair of sex chromosomes XY and 22 pairs of autosomes.

28. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Variation is high in sexually reproducing organisms compared to asexually reproducing organisms.
Reason: Inaccuracies during DNA copying give rise to variation.

29. Natural selection is called ‘survival of the fittest’. Which of the following statements best describes an organism?

30. The image shows the model of a family of dogs. It can be observed that the offspring is similar to the parent but not identical. What is the likely reason for this?