11. In a dihybrid cross, the progeny of an Fl individual (hetero2ygous for both characters) will show a phenotypic ratio of

A. 1:1:1:1
B. 1:2:2:1
C. 9:3:3:1
D. 3:1:1:3


Correct Answer: A. 1:1:1:1

12. In an organism, the chromosome number is maintained constant because of

A. independent assortment
B. crossing over
C. DNA duplication
D. synapsis


Correct Answer: C. DNA duplication

13. How many chromosomes are there in the budding yeast (S. cerevisiae)?

A. 16
B. 17
C. 18
D. 20


Correct Answer: A. 16

14. Which of the following is correct when a character shows continuous variation assuming a normal distribution?

A. It is governed by many genes with small cumulative effect
B. It is not controlled genetically
C. Many of the variation is due to fluctuation of climate
D. None of the above


Correct Answer: A. It is governed by many genes with small cumulative effect

15. Raphanobrassica is a classical example of

A. aneuploidy
B. nullisomy
C. allopolyploidy
D. None of the above


Correct Answer: C. allopolyploidy

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