When Mendel self pollinated the $F_{1}$ plants of genotype RrYr, in the $F_{2}$ generation, the yellow and green colour segregated in the ratio _________.

1 : 2 : 1

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3 : 1

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9 : 3 : 3 : 1

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1 : 1

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9 : 7.

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Solution

The correct option is B 3 : 1

In a dihybrid cross, a plant with yellow colour round seeds(YYRR) is crossed to green colour wrinkled(yyrr) seeds. In the F1 generation, plant with yellow colour wrinkled seeds(YyRr) are formed. When F1 plant is subjected to self pollination, in the F₂ generation 1YYRR, 2 YYRr, 2YyRR, 4YyRr, 1YYrr, 2Yyrr, 1yyRR, 2yyRr, 1yyrr are formed genotypically and 9 plants are Yellow round, 3 plants are yellow wrinkled, 3 plants are green round and 1 plant is green wrinkled are formed phenotypically. In this 12 progeny are with yellow coloured seeds, 12 progeny with round seeds 4 progeny with wrinkled seeds, 4 progeny with green seeds. The ratio between yellow and green coloured seeded progeny is 12:4 = 3:1
So, the correct option is ‘3:1’.

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Similar questions

Q. In dihybrid cross, when

F_{1}

plants (RrYy) are self-hybridised, the ratio of segregation of yellow and green in F

_{2}

Mendel first crossed pure-bred pea plants having round -yellow seeds with pure-bred pea plants having wrinkled -green seeds and found that only round- yellow seeds were produced in the $F_{1}$ generation. When $F_{1}$ generation pea plants having round-yellow seeds were cross-bred by self-pollination, then peas having round-yellow seeds, round green seeds, wrinkled-yellow seeds and wrinkled -green seeds were produced. Mendel collected a total of 2160 seeds.

(a) What will be the number of (i) round green seeds (ii) wrinkled green seeds (iii) round yellow seeds, and (iv) wrinkled-yellow seeds?

(b) Which 'ratio' as established by Mendel have you made use of in answering the part (a) above?

Q. Which among the following are correct statements regarding the F

_{2}

generation obtained in Mendelian dihybrid cross?
(a) Phenotypic ratio 9 : 3 : 3 : 1
(b) Genotypic ratio 4: 2: 2: 1: 2: 1: 2: 1: 1
(c)

\frac{1}{4}

plants are completely heterozygous.
(d)

F_{2}

generation is obtained through selfing of

F_{1}

plants.

Q. On selfing a plant of

F_{1}

generation with genotype "AABbCC", the genotypic ratio in

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On selfing a plant of $F_{1}$ generation with genotype AABbCC, the phenotypic ratio in $F_{2}$ generation will be:

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When Mendel self pollinated the F1 plants of genotype RrYr, in the F2 generation, the yellow and green colour segregated in the ratio _________.

When Mendel self pollinated the $F_{1}$ plants of genotype RrYr, in the $F_{2}$ generation, the yellow and green colour segregated in the ratio _________.