ZuoTi.Pro
Question

You cross two strains of yeast, one with red colonies and ethanol-sensitive and the other with...

You cross two strains of yeast, one with red colonies and ethanol-sensitive and the other with white colonies and ethanol-resistant. It is known that the color gene and the resistance genes are linked and located 20 cm apart. List the three types of asci you expect to observe in the meiosis of this hybrid (draw them out) with the genotype of all 4 spores in each. Which one will be the most and which will be the least common and why? If the genes were unlinked, would you see the same thing, which asci types would you get? and what would be the predicted frequencies for those types?
science   biology   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

The map distance between the two linked genes is 20cM.  

The percentage of recombination is 20%

The most common type were Yeast with red colony and ethanol sensitive and the yeast with white colony and ethanol resistant as they are parental type. 80% of the yeast population is like that.

the recombinant types were only near to 20% they are. Red colony with ethanol resistance and white colony with ethanol sensivity.  

If the genes are not linked the classical Mendelian ration- 9:3:3:1 may occur. the

9 Red Yeast with ethanol sensitivity: 3 Red yeast with ethanol resistant: 3White yeast with ethanol sensitivity: 1 white yeast with ethanol resistant.

0 0
Add a comment
Know the answer?
Add Answer to:
You cross two strains of yeast, one with red colonies and ethanol-sensitive and the other with...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

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

  • Two strains of yeast were mated and formed asci, each with four spores. The spores in...

    Two strains of yeast were mated and formed asci, each with four spores. The spores in each ascus were genotyped at two genes and the following types of asci were identified: Type 1 (AB AB ab ab) Type 2 (AB Ab aB ab) Type 3 (Ab Ab aB aB). 300 asci were genotyped and the number of each type ascus was: # asci found: Type I 32 Type II 75 Type III 193 Are these genes linked? State your reasoning....

  • 2. A diploid yeast was ABD on one chromosome and abd on the other. The yeast...

    2. A diploid yeast was ABD on one chromosome and abd on the other. The yeast cell underwent meiosis and the four genomes in the resulting tetrad were analyzed and determined to be: ABD, ABD, aBD and abd. a. For the moment, focus on the outcome regarding the number of B versus b genes? (Ignore D and d.) What is unexpected, regarding the number of gene types in the meiotic cells? Rationalize how this could have happened, assuming that this...

  • A cross was performed between a yeast strain that requires histidine and methionine for growth (His-Met-)...

    A cross was performed between a yeast strain that requires histidine and methionine for growth (His-Met-) and another yeast strain, which is His+Met+. One hundred asci were dissected, and colonies were grown from the four spores in each ascus. Cells from these colonies were tested for their ability to grow on petri plates containing either minimal medium(min), min+histidine (his), min+methionine (met),or min+his+met. The number of tetrads with four spores that can grow in different type of media is shown in...

  • 1.) Explain why linkage measurements are more accurate for two genes that are close together than...

    1.) Explain why linkage measurements are more accurate for two genes that are close together than two genes that are farther apart. 2.) A female poodle with green eyes (recessive) and yellow spots on her tongue (recessive) was bred with a male poodle who was the wild-type phenotype but hybrid genotype for those same two traits. In a series of litters, this breeding pair gave birth to the following 85 puppies: 39 Normal eyes, normal tongue 36 Green eyes, yellow-spot...

  • 1. In a cross between two pure-breeding varieties of radish, one with red and the other...

    1. In a cross between two pure-breeding varieties of radish, one with red and the other with white roots, all the F1 progeny had purple roots. The F2 obtained by selfing the F1 segregated as follows: Red Purple 80222 White 98 Two models (A and B) were suggested to account for these results:- A) Root colour is controlled by a single gene with two alleles showing incomplete dominance B) Root colour is controlled by two unlinked genes showing (recessive) epistasis....

  • 2. Suppose you have six strains of E. coli. One is wild type, and each of the other five has a single one of the follow...

    2. Suppose you have six strains of E. coli. One is wild type, and each of the other five has a single one of the following mutations: lacZ, lacY, laď·0; and lach. For each of these six strains, describe the phenotype you would observe using the following assays. Explain your answers. [Notes: (1) IPTG is a colorless synthetic molecule that acts as an inducer of lac operon expression but cannot serve as a carbon source for bacterial growth because it...

  • 4. In mice, the Ayallele of agouti is dominant for yellow coat color but is homozygous...

    4. In mice, the Ayallele of agouti is dominant for yellow coat color but is homozygous lethal. A yellow mouse, Ay/A, that is also heterozygous for the albino allele, C/c, is crossed to an albino mouse that is also heterozygous for the Ayallele, Ay/A. c/c. What phenotypic ratios do you expect in the progeny? (True or False) a. if these genes are unlinked: 3/8 yellow, 1/8 agouti, 1/2 albino b. if these genes are unlinked: 1/3 yellow, 1/6 agouti, 1/2...

  • You are provided the following recombination frequencies for four traits determined by four genes on one...

    You are provided the following recombination frequencies for four traits determined by four genes on one chromosome in corn (Zea mays). Based on this information, organize the genes in a way that represents their arrangement on the chromosome. dotted—yellow seedlings 7.3 mu bronze color—yellow seedlings 25 mu dotted—kernel color 26 mu kernel color—bronze color 4.8 mu dotted—bronze color 31.1 mu (3 pts) You are doing a genetics experiment with fruit flies. In the “P” generation, you cross two true-breeding flies....

  • You are working with an ornamental fish that shows two color phenotypes, red or blue. The...

    You are working with an ornamental fish that shows two color phenotypes, red or blue. The color is controlled by a single gene. These fish are hermaphrodites-meaning they can either (1) self-fertilize or (2) mate with another fish. You have three fish: fish 1, fish 2, and fish 3. While working further with this fish, you discover one other mutation (in a different gene) that leads to the recessive phenotype of long dorsal fins. Further research establishes that the genes...

  • 1. The following is a sequence of RNA. Do you expect it to adopt any kind...

    1. The following is a sequence of RNA. Do you expect it to adopt any kind of structure, and, if so, show what the structure would be? 5'-AUACUGCCCCCGGGGGAUGCCCGUAAACCGGGGUUACCCGGUUUAAACGGCCCCCCGGGGGCAGGCG-3'. 2. A dipoid yeast was ABD on one chromosome and abd on the other. The yeast cell underwent meiosis and the four genomes in the resulting tetrad were analyzed and determined to be: ABD, ABD, ABD and abd. a. For the moment, focus on the outcome regarding the number of B versus...

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