Class 12 Biology · Chapter 6 · Test 2
Dominance and Blood Groups
45 MCQs
45 questions · 35 min · 45 marks
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Sample questions
The first 5 of 45. Try each one, then tap to see the answer.
Question 1
The blood group AB may be given to a person who has blood group:
- AA
- BO
- CB
- DAB
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Answer: D
Blood group AB individuals have both antigens, so they can safely receive AB blood from a donor only if recipient is AB.
Question 2
If the father has blood group B and the mother has blood group A, what blood groups can their children have?
- AA or B only
- BAB only
- CAB or O only
- DA, B, AB or O
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Answer: D
If the parents are IBi and IAi, all four blood groups are possible.
Question 3
A gene for corn has alleles for yellow kernels and white kernels. Cross pollination of yellow corn and white corn gives ears with approximately equal numbers of yellow and white kernels. Which term best describes the relationship between the two alleles?
- ACrossing over
- BRecombination
- CIncomplete dominance
- DCodominance
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Answer: D
Both alleles are fully expressed in the heterozygote without blending.
Question 4
Which of these characters is controlled by a multiple allelic system?
- AABO blood group system
- BRh blood group system
- CMNS blood group system
- DAll of these
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Answer: A
The ABO system has three alleles, whereas the Rh and MN systems have two alleles each.
Question 5
Which of the following is a result of Erythroblastosis fetalis?
- AAnaemia in the foetus
- BJaundice in the foetus
- CMental retardation in the foetus
- DAll of these
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Answer: D
The condition causes haemolytic anaemia, jaundice from bilirubin and possible brain damage.
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