.A homozygous plant having round (R) and yellow (Y) seed is crossed with a homozygous plant having wrinkled(r) and green (y) seeds.:
Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F₂ generation when two plants of the F1 generation are crossed.

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Solution

Dihybrid phenotypic ratio- 9 :3 : 3 : 1
Phenotypes- Round and yellow, Round and green, wrinkled and yellow, wrinkled and green

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A homozygous plant having round(R) and yellow(Y) seeds are crossed with the homozygous plant having wrinkled(r) and green(y) seeds.-

Q. A homozygous plant having round (R) and yellow (Y) seed is crossed with homozygous plant having wrinkled (r) and green (y) seeds: [5 MARKS]
(a) Give the scientific name of the plant on which Mendel conducted his hybridisation experiments.
(b) Give the genotype of the F1 generation.
(c) Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation are crossed.
(d) Name and state the law which explains the dihybrid ratio.
(e) Give the possible combinations of gametes that can be obtained from F1 hybrid.

A homozygous plant having round (R) and yellow (Y) seed is crossed with a homozygous plant having wrinkled (r) and green (y) seeds.

Give the genotype of the F₁ generation.

Let us assume in a given plant the genotype symbol "Y" stands for dominant yellow seed colour and "y" for recessive green seeds colour symbol "R" for round seed shape and "r" for wrinkled seeds. Two homozygous parents (plants) with genotypes "RRYY" and "rryy" are crossed and their F1 generation progeny is then selfed. What shall be the

a) Phenotype of F1 progeny

b) Genotype of F1 progeny

c) Gemete genotype of F1 progeny

d) Phenotypic ratio of F2 population

e) Phenotypic ratio of yellow seed to green and round seed to wrinkled seed in F2 population.

Q. A pea plant with yellow and round seeds (YYRR) is crossed with a pea plant having green and wrinkled (yyrr) seeds, then in

F_{2}

generation of this dihybrid cross 320 plants are produced. Out of which 180 plants have some phenotypic characters. Identify this phenotype.

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.A homozygous plant having round (R) and yellow (Y) seed is crossed with a homozygous plant having wrinkled(r) and green (y) seeds.:Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation are crossed.

Dihybrid phenotypic ratio- 9 :3 : 3 : 1Phenotypes- Round and yellow, Round and green, wrinkled and yellow, wrinkled and green

.A homozygous plant having round (R) and yellow (Y) seed is crossed with a homozygous plant having wrinkled(r) and green (y) seeds.:
Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F₂ generation when two plants of the F1 generation are crossed.

Dihybrid phenotypic ratio- 9 :3 : 3 : 1
Phenotypes- Round and yellow, Round and green, wrinkled and yellow, wrinkled and green