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3. In the garden pea, Mendel found that yellow seed color was dominant to green (Y>y) and round seed shape was dominant to shrunken (S>s).

a). What phenotypic ratio would be expected in the F2 from a cross of a pure yellow, round x green, shrunken?

b). What is the F2 ratio of yellow: green and of round: shrunken?

Hi, Can you please explain clearly. Thank you.

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Reid Wolff
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Related questions

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 F2 generation of the cross RRYY x rryy?

(a) round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons

(b) only round seeds with green cotyledons

(c) only wrinkled seeds with yellow cotyledons

(d) only wrinkled seeds with green cotyledons

1. In Drosophila (fruit flies) ebony body color and being eyeless are both autosomal recessive traits. An ebony fly is mated with an eyeless fly and the F1 are all wild type.

The F2 are: 590 wild type

185 eyeless

200 ebony

72 eyeless and ebony

Test the hypothesis that this was a dihybrid cross (ratios) using the Chi Square test.

2. In corn, purple kernels are dominant over yellow kernels, and full kernels are dominant over shrunken kernels.

A plant with purple, full kernels is crossed with a plant having yellow, shrunken kernels and the following progeny are obtained:

Purple, full 115

Purple, shrunken 110

Yellow, full 95

Yellow, shrunken 94

Determine the most likely genotypes for the parents and progeny.

Test your genetic hypothesis (ratios) with a Chi Square test until it is accepted.

3. A corn plant with purple, full kernels is crossed with a plant having purple, full kernels. The following progeny are obtained:

Purple, full 100

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Yellow, shrunken 8

Determine the genotypes of the parents and progeny.

Test your hypothesis with a Chi square test until it is accepted.

4. A candy manufacturer claims that it puts equal numbers of different colored candy in each packet they sell. You buy a packet and find these results:

Red: 101 Green: 120 Blue: 133 Orange: 103 Yellow: 110 Brown: 153

Does the manufacturer’s claim hold true? Use the Chi square test to determine whether to accept or reject this claim (that each bag has the same number of each color of candy).

You recently discovered a new variety of sweetpea plants in the area surrounding Chernobyl that cannot be crossedwith the sweet pea plants used in Mendel's experiments. Youidentify several pure breeding strains with characteristics thatare similar to those described by Mendel. You found that round (R)was dominant over wrinkled (r) for pea shape and yellow (Y) wasdominant over green (y) for pea colour in monohybridcrosses.


(a) show the expected outcome of a dihybridcross starting with pure breeding plants with round yellow peas andpure-breeding wrinkled green peas. Include all phenotypes and thecorresponding genotypes for parental, F1 and F2 generations. Alsoinclude the expected phenotypic ratios for the F2 generation.Surprisingly, when you performed this cross, you notice someinteresting differences from Mendel's experiments. Although all F1progeny had round yellow peas, the F1 self cross resulted in farfewer round green and wrinkled yellow peas than expected. Beingvery clever, you hypothesize that these loci may be linked in thisvariety of pea and you performed a testcross between F1 plants anddouble homozygous plants with wrinkled green peas. You obtained thefollowing progeny: 445 Round yellow, 48 round green, 52 wrinkledyellow and 455 wrinkled green. (b) Identify the parental andrecombinant classes from the test cross (2 marks). (c) Estimate therecombination frequency using these data, and show your work. (d)Indicate the distance between loci in map units, and show yourwork. (e) Using the recombination frequency you calculated in (c),predict the phenotypic ratio in the F2 generation in the dihybridcross in (a)

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