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1. In Saccharomyces cerevisae a cross involving three linked genes is made (ABCxabc). Among 200 asci, one is found to contain the spores ABC, abc, Abc, and abC. What is unusual about this ascus? what event couold explain this ascus?

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Deanna Hettinger
Deanna HettingerLv2
28 Sep 2019

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Related questions

1)

An individual heterozygous for three genes with the phenotype ABC is test crossed to a homozygous individual (phenotype abc). The following offspring are observed:

ABC 100

abc 100

Abc 90

aBC 90

ABc 300

abC 300

AbC 350

aBc 350

a. How many genes are linked? How do you know this?

b. What genes are linked? How do you know this?

c. What is the distance between the two linked genes?

2)

In panthers, black coat (g) is recessive to golden coat (G), pink eyes (b) is recessive to blue eyes (B), and short tail (l) is recessive to long tail (L). A female heterozygous for all three genes is test crossed to a homozygous recessive male and the following offspring were obtained:

BGL 70

BgL 78

bGL 358

BGl 4

bgL 8

Bgl 344

bGl 70

bgl 68

a. How many genes are linked? How do you know this?

b. Which groups are the parentals? How do you know this?

c. What do the other groups represent?

d. What is the correct gene order?

e. What are the distances between all of the linked genes?

An organism heterozygous for three genes, AaBbCc was mated to a homozygote aabbcc, resulting in the progeny distrubution below.

ABC 327

aBC 44

AbC 30

ABc 3

abC 4

aBc 45

Abc 28

abc 319

What is the order of the genes?

Answer: A, C, B

*I know which genes are partental, I know which genes are single cross over, and I know which genes are double cross over* I have no idea how to solve this for the gene order.

You have done a cross between two strains of yeast, one strain has the genotype A B C and the other strain has the a b c genotype, where the letters refer to three rather closely linked genes in the order given. You analyzed many tetrads resulting from this cross, and you find two tetrads that do not contain the expected two B and two b spores. In tetrad I, the spores are A B C, A B C, a B c, and a b c. In tetrad II, the spores are A B C, A b c, a b C, and a b c. Explain how these unusual tetrads could have been produced?

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