1. | 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 |
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Answer: (a).1:1:1:1
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2. | In an organism, the chromosome number is maintained constant because of |
a. | independent assortment |
b. | crossing over |
c. | DNA duplication |
d. | synapsis |
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Answer: (c).DNA duplication
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3. | How many chromosomes are there in the budding yeast (S. cerevisiae)? |
a. | 16 |
b. | 17 |
c. | 18 |
d. | 20 |
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Answer: (a).16
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4. | 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 |
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Answer: (a).It is governed by many genes with small cumulative effect
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5. | Raphanobrassica is a classical example of |
a. | aneuploidy |
b. | nullisomy |
c. | allopolyploidy |
d. | None of the above |
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Answer: (c).allopolyploidy
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