Chp 22 New.docx

Global Academy Westridge Test Series – 2019 BIOLOGY-XII

Time: 40 mins

Chapter#22

Marks: 25

1. Select the proper answer.

Part-A (05 Marks)

i.

In colour blindness in man the gene for red and green opsins are located on X chromosome, while gene for blue opsins is present on chromosome number… a. 19 b. 07 c. 09 d. 11 ii. Gene located on same locus but having different expression are a. Multiple alleles b. Oncogenes c. Polygenes d. Co-dominant iii. What is the risk of a colour blind child in a family when the mother is colour blind and father is normal?

a. 25% b. 50% c. 75% d. 100% iv. Baldness in man is which type of trait? a. Sex linked b. Sex limited c. Sex influenced d. Pseudoautosomal v. There is always chance of erythroblastosis foetalis when mother _________and foetus_____. a. Rh-ve , Rh-ve b. Rh-ve , Rh+ve c. Rh+ve, Rh-ve d. Rh+ve, Rh+ve

Part-B (Short Questions)  i. ii. iii. iv.

(4 x 3 = 12 Marks)

Attempt all Questions:Difference between epistasis and dominance. Explain Rh factor in man. What are continuously varying traits? Explain with an example. Eye colour in drosophila is x – linked trait. Make a cross between a white eyed female with a red eyed male Part-C (Subjective)

(08 Marks)  Long question v. a) Coat colour in Labrador .(04) b) Law of segregation with example. (04)