Mendelian inheritance
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See all →- Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation? Answer: 3. Phenotypic ratio - 9 : 3 : 3 : 1 Key idea: This is a standard dihybrid cross. RRYY x rryy gives F1 RrYy (all round yellow). Selfi... 1
- 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 F_2 generat… Answer: 3. A, C, D and E only Key idea: the Law of Dominance covers factors in pairs, dominant and recessive factors, and expression of only... 1
- Match List I with List IIList I: A. Two or more alternative forms of a gene; B. Cross of F_1 progeny with homozygous recessive parent; C. Cross of F_1 progeny with any of the parents; D. Number of chromosome sets in plantList II: I. Back cross; II. P… Answer: 4. A-III, B-IV, C-I, D-II Key idea: match the genetic term with its definition. Alternative forms of a gene: allele (III). Cross of... 1
- In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it? Answer: 3. bb Key idea: an unknown dominant phenotype is tested by a test cross with the homozygous recessive parent. Cross the black plant... 1
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :Mendel's law of Independent assortment does not hold good for the genes that are located closely on the same chromosome.Reason (R… Answer: 4. (A) is correct but (R) is not correct Assertion: genes close together on the same chromosome are linked and tend to be inherited... 1
- Given below are two statements :Statement I :Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of InheritanceStatement II :Seven characters examined by Mendel in his experiment on pea plants were seed shape and colo… Answer: 2. Both Statement I and Statement II are correct Mendel studied seven pairs of contrasting traits in pea and proposed the laws of in... 1