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A homozygous strain of yellow corn is crossed with a homozygousstrain of purple corn. All the F1s are purple. The F1 areintercrossed, producing ears of corn with 238 purple kernels and178 yellow kernels. Give a genetic explanation for the differencesin kernel color, and their ratios in this cross. Hints:Consider some sort of interaction ofalleles at two different, independently segregating genesand Consider some permutationor combination of a 9:3:3:1 ratio

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Casey Durgan
Casey DurganLv2
28 Sep 2019

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Related questions

A homozygous strain of yellow corn is crossed with a homozygous strain of purple corn. The F1 are intercrossed producing an ear of corn with 119 purple kernels and 89 yellow kernels. (1)Does the pattern of inheritance follow a monohybrid cross for a simple dominant trait? Explain using a chi-squared analysis. (2) Propose another hypothesis for the method of inheritance. (3) Calculate the chi-square value for this cross, based on your hypothesis. (4) Look up the p-value in the chi-square table provided on the last page. Should you reject or fail to reject your hypothesis, using a significance level of 5%?

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

Purple, shrunken 36

Yellow, full 30

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).

Canaries: Green (wild-type) Pied phenotype Yellow type

Canaries are popular pets and easy to breed in captivity. Additionally, they display great phenotypic diversity, which allows you to do some interesting genetic investigations with them.

When you take a canary from a true-breeding green strain and cross it with a canary from a true-breeding yellow strain, all offspring display the pied phenotype. Based on this you suspect that this color variation is inherited by a gene with a co-dominant inheritance pattern (showing both phenotypic traits in hybrid phenotypes).

You decide to test this hypothesis. To do so, you take pairs of your hybrid F1 individuals (of pied phenotype), and cross them to produce an F2 generation.

After many dozens of crosses and hundreds of offspring, you arrive at the peculiar ratio of:

3/16 green : 6/16 pied : 7/16 yellow

Which of the following hypotheses are consistent with these data? (Note that not all of these hypotheses are mutually exclusive. Assume that the two genes are independently assorting)

Hint: This problem is very hard to work from the given ratios to what is happening genetically. It is easier to "work backwards" and start with each choice below, and see if you can obtain all or important aspects of the results of your cross when making the assumption that the answer choice is correct.

Select all that apply:

Select one or more:

a. At least one of the genes involved is sex linked.

b. One gene controls production of darker pigment (melanin which appears green when mixed with yellow). A second gene acts as a patterning gene with one allele causing expression and the other non-expression of melanin and when in the heterozygous condition each allele controls melanin expression on different parts of the body so long as the bird's genotype of the first gene allows for the production of melanin.

c. this is a single-gene trait with co-dominance

d. one of the two genes involved displays complete dominance, while the other displays co-dominance.

e. the genes involved are epistatically interacting

f. more than one gene is involved

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