Question

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 expected proportions in the F2.

b. An F1 plant is crossed with a plant that has glossy, cream fruit and non-bitter cotyledons. Give the phenotypes and expected proportions among the progeny of this cross.

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

The genotype of dull, orange fruit and bitter cotyledons = DDRRBB

The genotype of glossy, cream fruit and non-bitter = ddrrbb

In f1 generation, all the progeny will have DdRrBb genotype.

In the f2 generation number of phenotypes can be calculated by the probability method.

First, we calculate the probability for a monohybrid cross and then phenotypes fraction obtained by combining them

Dull fruit Dd x Dd

D d
D DD Dd
d Dd dd

Probability of the dull phenotype = 3/4

Probability of the glossy phenotype = 1/4

Orange fruit Rr x Rr

R r
R RR Rr
r Rr rr

Probability of the Orange fruit = 3/4

Probability of the Cream fruit = 1/4

Bitter fruit Bb x Bb

B b
B BB Bb
b Bb bb

​​​probability of Bitter cotyledons = 3/4, probability of nonbitter cotyledon = 1/4

Add a comment
Know the answer?
Add Answer to:
In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R) is dominant...
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
  • 17. In watermelons, bitter fruit (B) is dominant over sweet fruit (b), and yellow spots (S)...

    17. In watermelons, bitter fruit (B) is dominant over sweet fruit (b), and yellow spots (S) are dominant over no spots (s). The genes for these two characteristics assort independently. A homozygous plant that has bitter fruit and yellow spots is crossed with a homozygous plant that has sweet fruit and no spots. The F1 are intercrossed to produce an F2. a. What are the phenotypic ratios in the F2? b. If an F1 plant is backcrossed with the bitter,...

  • Describe the phenotypes and genotypes Ure 16. In watermelons, bitter fr atermelons, bitter fruit is dominant...

    Describe the phenotypes and genotypes Ure 16. In watermelons, bitter fr atermelons, bitter fruit is dominant over sweet fruit, and yellow spots are dominant over no spots. ung these are independently assorted traits, a homozygous plant that produces fruit bitter with ow spots is crossed with a homozygous plant with fruit sweet and spotless. The F1 are intercrossed to produce F2. a. What are the phenotypic ratios in F2? b. If an F1 plant is backcrossed with the bitter, spotted...

  • This is the feedback I got for the wrong answers I put in the blanks. Please...

    This is the feedback I got for the wrong answers I put in the blanks. Please help correct me! This tutorial will take you step by step through the question. In cucumbers, dull fruit (D) is dominant to glossy fruit (d), and orange fruit (R) is dominant to cream-colored fruit (r). The gene that codes for dull versus glossy assorts independently from the gene that codes for orange versus cream-colored. A plant that has dull and orange fruits is crossed...

  • In cucumbers, green color (W) is dominant over yellow color (w) and spiked cucumbers (D) are...

    In cucumbers, green color (W) is dominant over yellow color (w) and spiked cucumbers (D) are dominant over smooth cucumbers (d). A cucumber plant true-breeding for green, spiked cucumbers is crossed with a plant true-breeding for yellow, smooth cucumbers. 1. What will the phenotypes and genotypes of the F1 generation be? 2. If the above F1 progeny are self-crossed, what ratio of the F2 offspring will be: WwDd wwDd WWDD wwDD 3. What ratio will have green spiked cucumbers? 4....

  • Question 4 1 pts In cucumbers, dull skin (D) is dominant over shiny skin (d), and...

    Question 4 1 pts In cucumbers, dull skin (D) is dominant over shiny skin (d), and warty fruit (W) is dominant over smooth fruit (w). A farmer has two dull, warty cucumber plants (Plant 1 and Plant 2), and crosses each with a shiny, smooth plant. The farmer obtains the following numbers of progeny. Plant 1 offspring Plant 2 offspring Dull, warty 89 Dull, smooth Shiny, warty Shiny, smooth 81 Total 186 154 What are the genotypes and correct allelic...

  • 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...

  • In cats, curled ears result from an allele (Cu) that is dominant over an allele (cu)...

    In cats, curled ears result from an allele (Cu) that is dominant over an allele (cu) for normal ears. Black color results from an independently assorting allele (G) that is dominant over an allele for gray (g). A gray cat homozygous for curled ears is mated with a homozygous black cat with normal ears. All the F1 cats are black and have curled ears. a. If two of the F1 cats mate, what phenotypes and proportions are expected in the...

  • 1. In humans, dark hair (D) is dominant over blond hair (d). If a heterozygous dark...

    1. In humans, dark hair (D) is dominant over blond hair (d). If a heterozygous dark haired man had a son with his blond haired wife, what would the probability be that the son would have dark hair like his father? 2. a) In tomatoes, red fruit (R) is dominant over yellow fruit. If a homozygous red fruit plant is crossed with a yellow fruit plant, what are the expected genotypic and phenotypic ratios of the F1 generation? b) if...

  • Item 15 Part A In a diploid species of plant, the genes for plant height and...

    Item 15 Part A In a diploid species of plant, the genes for plant height and fruit shape are syntenic and separated by 18mu. Allele D produces tall plants and is dominant to d for short plants, and allele R produces round fruit and is dominant to r for oval fruit. If the Fi are crossed to short plants producing oval fruit, what are the expected percentages of progeny phenotypes? Express your answers using two significant figures separated by commas....

  • 2. Fruit color in eggplants is controlled by a single autosomal gene, R, with two alleles...

    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)....

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