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Biology
Principles of Inheritance and Variation
198 questions from 38 papers, each with its answer.
- 198 questions
- 38 papers
- 5.62% of Biology
Incomplete Dominance in Snapdragon
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A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?Flower colour in snapdragon shows incomplete dominance: RR = red, Rr = pink, rr = white. Pink (Rr) × Red (RR) gives RR (red) and Rr (pink) in a 1 : 1 ratio. So both red flowered and pink flowered plants are expected.
Genetics Terminology (Allele, Test Cross, Back Cross, Ploidy)
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Match List I with List II regarding genetics terminology.
Pick the matching item from Column II for each row.
Column I
- A. Two or more alternative forms of a gene
- B. Cross of F1 progeny with homozygous recessive parent
- C. Cross of F1 progeny with any of the parents
- D. Number of chromosome sets in plant
Column II
- I. Back cross
- II. Ploidy
- III. Allele
- IV. Test cross
Correct answer: A → III, B → IV, C → I, D → II
Two or more alternative forms of a gene – allele Cross of $F_1$ progeny with homozygous recessive parent – test cross Cross of $F_1$ progeny with any of the parents – back cross Number of chromosome sets in a plant – ploidy Correct match: A-III, B-IV, C-I, D-II.
Mendel's Law of Dominance
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Which one of the following can be explained on the basis of Mendel's Law of Dominance? A. Out of one pair of factors one is dominant and the other is recessive. B. Alleles do not show any expression and both the characters appear as such in F2 generation. C. Factors occur in pair in normal diploid plants. D. The discrete unit controlling a particular character is called factor. E. The expression of only one of the parental characters is found in a monohybrid cross. Choose the correct answer from the options given below:The Law of Dominance explains that characters are controlled by discrete units called factors (D), that factors occur in pairs in normal diploid plants (C), that of a pair of dissimilar factors one is dominant and the other recessive (A), and that only one of the parental characters is expressed in a monohybrid cross (E). Statement B is not explained by the law of dominance. So A, C, D and E only are correct.
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