A. Monohybrid Cross to study the trait seed shape. 1. Parent Generation: Mendel

Question

A. Monohybrid Cross to study the trait seed shape. 1. Parent Generation: Mendel crossed pure-breeding round-seeded plants with pure-breeding wrinkled-seeded plants to produce an F1 generation. Use R to indicate the dominant allele for round seeds and r to indicate the recessive allele for wrinkled seeds and write the genotypes of the pure-breeding parents and the F1 monohybrids. Round-seeded Parent Wrinkled-seeded parent: F1 monohybrid 2. Dominance: The F1 from the above cross produced shaped seeds. This indicates that is the dominant phenotype for seed shape and _ is the recessive phenotype for seed shape. 3. The Monohybrid Cross: Mendel allowed the F1 to self-fertilize (F1 x F1) to produce an F2 generation. Use the Punnett Square below to write the gametes types and proportions produced by the F1 plants and to predict the progeny (offspring) types and proportions that will be produced. One parent's gamete types go here One parent's gamete types go here Progeny (offspring) genotypes here 4. Use the information inside the four-boxed Punnett square to determine the genotypic ratio among the F2 progeny from the monohybrid cross. 5. Use your understanding of dominance from step 2 and the genotypic ratio from step 4 to determine the phenotypic ratio among the F2 progeny from the monohybrid cross.

Explanation / Answer

A.1. Mpnohybrid cross

Round seeded parent : RR    Wrinkled seeded parent: rr

F1 monohybrid: Rr

2. Dominance:The F1 from the above cross produced round shaped seeds. This indicates that round is the dominant phenotype for seed shape and wrinkled is the recessive phenotype for the seed shape.

3.

R

r

R

RR

Rr

r

Rr

rr

4. 1:2:1

5. 3:1

B. 1

Round, yellow seeded parent : RRYY Wrinkled, green seeded parent: rryy

F1 dihybrid: RrYy

2. Dominance:,The F1 from te above cross produced round, yellow seeds. This indicates that round and yellow are the dominant phenotypes and that wrinkled and green are the recessive phenotypes.

3.

RY

Ry

rY           

ry

RY

RRYY

RRYy

RrYY

RrYy

Ry

RRYy

RRyy

RrYy

Rryy

rY

RrYY

RrYy

rrYY

rrYy

ry

RrYy

Rryy

rrYy

rryy

4. 9:3:3:1

R

r

R

RR

Rr

r

Rr

rr

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