Question

2. Fruit color in eggplants is controlled by a single autosomal gene, R, with two alleles R and r. When a homozygous plant that produces purple fruit (RR) is crossed with a homozygous plant that produces white fruit (rr), all F1 offspring produce violet eggplants. When the F1 progeny are testcrossed, the F2 progeny produce 160 violet eggplants, and 154 white eggplants. Design a hypothesis for the mode of inheritance of eggplant color (explicitly state your null and alternate hypotheses). Test this hypothesis using a chi-squared test. Use the chi-squared critical value table provided to determine the outcome of your statistical test. Explain the results obtained (i.e. interpret the p-value).

0 0
Add a comment Improve this question Transcribed image text
Answer #1

Given that all the F1 progenies produce violet eggplant which is not present in either of the parents. So the mode of inheritance is Co-dominance. When we perform test cross we get the violet colour and white colour progenies in 1:1 ratio.

(Observed - Expected)2 Expected ˋ亡-

Observed(O) Expected (E) (O-E) (O-E)2/E
Violet 160 157 3 0.057325
white 154 157 3 0.057325
Total 314 0.11465

So the Chi-square value is 0.114

the degree of freedom is given by the number of phenotypes - 1

There are two phenotypes that we observed in the cross. So the degree of freedom f is 2-1 = 1

So for the degree of freedom 1 when the p-value is 0.05 CHi-square value is 3.84 which is greater than the observed chi-square value. So out hypothesis correct

Add a comment
Know the answer?
Add Answer to:
2. Fruit color in eggplants is controlled by a single autosomal gene, R, with two alleles...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
  • 4. In summer squash, fruit color and shape are controlled by two independently assorting genes as...

    4. In summer squash, fruit color and shape are controlled by two independently assorting genes as follows: Trait Gene Alleles Phenotypes Fruit color W W w White fruit yellow fruit Fruit shape D D d Disk-shaped fruit sphere-shaped fruit A homozygous White Disk plant has been crossed with a homozygous Yellow Sphere plant (this is the P1 generation). List the expected genotype and phenotype of the F1 plants? P1   WWDD x wwdd F1    WwDd Genotype: WwDd Phenotype: White, Disk If...

  • In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R) is dominant...

    In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R) is dominant over cream fruit (r), and bitter cotyledons (B) are dominant over non-bitter cotyledons (b). The three characters are encoded by genes located on different pairs of chromosomes. A plant homozygous for dull, orange fruit and bitter cotyledons is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons. The F1 are intercrossed to produce the F2. a. Give the phenotypes and their...

  • In a certain plant, a dominant allele for one gene, R, produces round fruit and the...

    In a certain plant, a dominant allele for one gene, R, produces round fruit and the recessive allele, r, produces oblong fruit. A dominant allele of a second gene, Y, produces yellow flowers and the recessive allele, y, produces white flowers. The two genes are linked on chromosome IV. A plant ( ry / ry ) with normal chromosomes is crossed to a plant (R Y/R Y) homozygous for a reciprocal translocation between chromosomes IV and VIII. The presence of...

  • 3-3. In the fruit fly, Dichaete (D) is a dominant autosomal mutation that affects wing shape;...

    3-3. In the fruit fly, Dichaete (D) is a dominant autosomal mutation that affects wing shape; it is lethal when homozygous. Ebony body, e, and rose eye, r, are recessive mutations also located on the same chromosome. Dichaete flies were crossed to pure-breeding ebony, rose flies. Among the F1 were Dichaete progeny with normal body and eye color. Female Dichaete F1 were test-crossed to ebony, rose males, with the results listed below. (Show your work!) A. Write the genotypes of...

  • In a species of plant, two genes control flower color. The red allele (R) is dominant...

    In a species of plant, two genes control flower color. The red allele (R) is dominant to the white allele (r); the color producing allele (C) is dominant to the non color producing allele (c). You suspect that either an rr homozygote or a cc homozygote will produce white flowers. In other words, rr is epistatic to C, and cc is epistatic to R. to test your hypothesis, you allowed heterozygous plants (RrCc) to self fertilize and count the offspring....

  • You are investigating two traits in fruit flies controlled by one autosomal dominant gene each. The...

    You are investigating two traits in fruit flies controlled by one autosomal dominant gene each. The B gene controls for body color (B=black or b=brown), while the r gene controls for body sculpture (R=rugose or r=smooth). After crossing heterozygous rugose black flies with homozygous smooth brown flies, you obtain an F1 generation of 100% rugose black flies. 1. What are the dominant alleles? 2. What are the genotypes of the two parent flies to perform a dihybrid cross? 3. Of...

  • 2. You cross a homozygous wildtype female Drosophila (fruit fly) with a male that has a black body (bb). You mate two of the F1 (first generation) flies and examine the F2 (second generation) off...

    2. You cross a homozygous wildtype female Drosophila (fruit fly) with a male that has a black body (bb). You mate two of the F1 (first generation) flies and examine the F2 (second generation) offspring. The phenotypes can be seen in the table below. a. Draw a pedigree to show the P, F1, and F2 generations. You only need to draw one fly with each phenotype for the F2 generation. seen in this cross. the expected values for a cross...

  • using spss and write conclusion and steps 2. The color of fruit for plant "X" is determined by two alleles A and a. When two plants with orange fruits (Aa) are crossed the following phenot...

    using spss and write conclusion and steps 2. The color of fruit for plant "X" is determined by two alleles A and a. When two plants with orange fruits (Aa) are crossed the following phenotypic results are present in the offspring: 27 red fruit (AA), 59 orange fruit (Aa), 24 yellow fruit (aa). So you suspect this is an incomplete dominance case, which means the phenotypic ratio should follow 1:2:1 ratio. Using the data collected to test for this hypothesis....

  • In guinea pig, white coat (f) is recessive to black coat (F) and curly hair (h)...

    In guinea pig, white coat (f) is recessive to black coat (F) and curly hair (h) is recessive to straight hair (H). A breeder crosses a guinea pig that is homozygous for white coat and curly hair with a guinea pig that is black with straight hair. The F1 are then crossed with guinea pig having white coat and curly hair in a series of testcrosses. The following progeny are produce from these testcrosses: white, curly 31 white, straight 12...

  • 2. Coat color in mice can be albin mice; the following progeny were obtained gouti mice...

    2. Coat color in mice can be albin mice; the following progeny were obtained gouti mice were crossed with albino agouti black albino Total 100 187 402 a. How many genes are involved? Define gene symbols and indicate which genotype yielded each phenotype. In your answer, explain the genetic principle (s) involved. Conduct a Chi-square goodness of fit to test your ideas about the mode of inheritance. The purpose of this test should be to evaluate your answer to (a)....

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT