A pea plant with pure yellow (YY) and round (RR) seeds were crossed with a plant having pure green (yy) wrinkled (rr) seeds.
If the off-springs of the the F-₁generation are self-pollinated, what would be the phenotypic ratio in F-₂generation?

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Solution

In the experiment, a cross is made between a homozygous plant with yellow round seeds(YYRR) and a homozygous plant with green wrinkled seeds (yyrr).
In the F-₁ generation, all the off-springs show yellow round seeds(YyRr).
The F-₁ generation off-springs are self-pollinated to obtain F-₂ generation where four different types of seed combinations are obtained.
The combination is due to the expression of recessive characters in absence of a dominant factor.
Different combinations obtained in F-₂ generation can be seen in Punnett square.
♂
♀
RY Ry rY ry
RY RRYY RRYy RrYY RrYy
Ry RRYy RRyy RrYy Rryy
rY RrYY RrYy rrYY rrYy
ry RrYy Rryy rrYy rryy
The phenotypic ratio is 9:3:3:1 for round yellow: round green: wrinkled yellow: wrinkled green.

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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?

A pea plant with pure yellow (YY) and round (RR) seeds were crossed with a plant having pure green (yy) wrinkled (rr) seeds.

On which law, following is based:

The off-springs of the F-₁ generation are self-pollinated.

A pea plant with pure Yellow (YY) Round (RR) seeds was crossed with a plant having pure green (yy) wrinkled (rr) seeds. What would be the nature of offspring in the F1- generation?

Q. Question 5
If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant (rr YY), the seeds produced in F1 generation are

(a) round and yellow
(b) round and green
(c) wrinkled and green
(d) wrinkled and yellow

Q. In garden pea plant, a pure line with round seeds(RR) is crossed with a pure line having wrinkled seeds (rr). The ratio of round seed plants to wrinkled seed plants in

F_{2}

generation will be?

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♂ ♀	RY	Ry	rY	ry
RY	RRYY	RRYy	RrYY	RrYy
Ry	RRYy	RRyy	RrYy	Rryy
rY	RrYY	RrYy	rrYY	rrYy
ry	RrYy	Rryy	rrYy	rryy

A pea plant with pure yellow (YY) and round (RR) seeds were crossed with a plant having pure green (yy) wrinkled (rr) seeds. If the off-springs of the the F-1 generation are self-pollinated, what would be the phenotypic ratio in F-2 generation?

A pea plant with pure yellow (YY) and round (RR) seeds were crossed with a plant having pure green (yy) wrinkled (rr) seeds.
If the off-springs of the the F-₁generation are self-pollinated, what would be the phenotypic ratio in F-₂generation?