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Dihybrid Cross of Mendel MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
Quick Facts
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Dihybrid Cross is considered one of the most asked concept.
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17 Questions around this concept.
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An organism of genotype AaBb can make gametes of all the following kinds except:
Concepts Covered - 1
Dihybrid Cross
- Mendel also worked with and crossed pea plants that differed in two characters, as is seen in the cross between a pea plant that has seeds with yellow colour and round shape and one that had seeds of green colour and wrinkled shape.
- Mendel found that the F1 progeny resulting from the crossing of the parents, had yellow coloured and round shaped seeds.
- Thus, yellow colour was dominant over green and round shape dominant over wrinkled.
- Let us use the genotypic symbols Y for dominant yellow seed colour and y for recessive green seed colour, R for round shaped seeds and r for wrinkled seed shape.
- The genotype of the parents can then be written as RRYY and rryy.
- The gametes RY and ry unite on fertilisation to produce the F1 hybrid RrYy.
- When Mendel self hybridised the F1 plants he found that 3/4th of F2 plants had yellow seeds and 1/4th had green.
- The yellow and green colour segregated in a 3:1 ratio.
- Round and wrinkled seed shape also segregated in a 3:1 ratio; just like in a monohybrid cross.
- In the dihybrid cross, the phenotypes round,yellow; wrinkled, yellow; round, green and wrinkled, green appeared in the ratio 9:3:3:1.
- The phenotypic ratio of 9:3:3:1 occurs in 9 types of genotypes.
- Such a ratio was observed for several pairs of characters that Mendel studied.
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