Page 70 - Biology - XII

Q14. What does symbol represent in a pedigree chart?

(a) Carrier (b) Trait being studied (c) Female carrier (d) None of these
Q15. Pedigree chart study is done for
(a) family history for a trait (b) movement (pattern) of a trait

(c) knowledge (d) both (a) and (b)
Q16. Colour blindness is common in
(a) females (b) males (c) both (a) and (b) (d) none of these

Q17. Why are human males frequently colour-blind in comparison to human females?
(a) It is sex linked. (b) It is sex limited.
(c) It is x-chromosome linked. (d) Both (a) and (c).

Q18. What is the number of human traits and diseases associated with specifi c genes?
(a) 200 (b) 400 (c) 4000 (d) 5000

Answer key

1. (d), 2. (c), 3. (b), 4. (d), 5. (a), 6. (b), 7. (c), 8. (a), 9. (a), 10. (b), 11. (d), 12. (b), 13. (d), 14. (d),
15. (d), 16. (b), 17. (d), 18. (c)

Assertion-Reason Type Questions

These consist of two statements—Assertion (A) and Reason (R). Answer these questions by selecting
the appropriate option given below:
a. Both A and R are true and R is the correct explanation of A.

b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
1. Assertion (A) : Pedigree analysis helps to work out the possible genotypes from the knowledge
of the respective phenotypes.

Reason (R) : Pedigree is a chart showing record of inheritance of certain traits over two or
more ancestral generation of a person.
Answer key

1. (a)

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