If so pea plant with round and green seeds is bred with plant having wrinkled and yellow seeds how many different phenotypes will be observed in F2 generation list them and mention the ratio. Also specify the genotypes of the parents if we take R for round and r for wrinkled and G for green and g for yellow assuming round to be dominant over wrinkled and green over yellow.

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Solution

Round and green plant is dominant in both charecetrs. Its genotype will be RRGG.
Wrinkled and yellow plant will be recessive in both charecters.Its genotype will be rrgg.
When two such plants are crossed F1 generation will be RrGg.When two such plants are crossed, in the F2 generation,
we can observe 4 phenotypes.Round and green,round and yellow,wrinkled and gree, wrinkled and yellow in a ratio 9:3:3:1 respectivevly.

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Question 5
If a round, green-seeded pea plant (RRyy) is crossed with wrinkled, yellow-seeded pea plant (rrYY), the seeds produced in F1 generation are

(a) round and yellow
(b) round and green
(c) wrinkled and green
(d) wrinkled and yellow
( Round-R, Green-y, Wrinkled-r, Yellow-Y)

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 round and yellow seeds (RRYY) is crossbred with another pea plant having wrinkled and green seeds (rryy). Among the offspring obtained in F₂ generation, plants with which traits were found to be maximum in number?

Q. In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the

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R R Y Y \times r r y y

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 same phenotypic characters. Identify this phenotype.

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