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Test Cross MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
Quick Facts
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Test Cross is considered one of the most asked concept.
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8 Questions around this concept.
Solve by difficulty
A test cross is carried out to :
The genotype of a plant showing the dominant phenotype can be determined by:
Test cross in plants or in Drosophila involves crossing
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Match the terms in Column I with their description in Column II and choose the correct option:
| Column I |
Column II |
|
(a) Dominance |
(i) Many genes govern a single character |
| (b) Codominance |
(ii) In a heterozygous organism only one |
| (c) Pleiotropy |
(iii) In a heterozygous organism both alleles |
| (d) Polygenic inheritance |
(iv) A single gene influences |
Codes:
(a) (b) (c) (d)
Concepts Covered - 1
Test Cross
- From what we have learnt, it is clear that though the genotypic ratios can be calculated using mathematical probability, but simply looking at the phenotype of a dominant trait, it is not possible to know the genotypic composition.
- Therefore, a test cross is performed between phenotypically dominant plant (whose genotype is unknown) and a recessive plant (whose genotype is obviously homozygous recessive).
- Result:
- If the dominant-expressing organism is a homozygote, then all F1 offspring will be heterozygotes expressing the dominant trait.
- If the dominant expressing organism is a heterozygote, the F1 offspring will exhibit a 1:1 ratio of heterozygous and recessive homozygotes.
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