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The map units between locus A and B are 12.5. The map units between locus B and C are 6.5 units. Assume linkage and gene order A,B,C. A) What is the probability of double crossover offspring between these three loci? B) A heterozygous parent A/a b/B c/C is crossed to a tester. What are the probabilities of the following offspring? 1.A/a b/b c/c 2.A/a B/b c/c 3.A/a b/b C/c 4.a/a b/b c/c

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Beverley Smith
Beverley SmithLv2
28 Sep 2019

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Related questions

(Problem 13) Alleles A and a are at a locus on the same chromosome as is a locus with alleles B and b. Aa Bb is crossed with aa bb and the following progeny are produced:

Aa Bb × aa bb progeny

Aa Bb 5

Aa bb 45

aa Bb 45

aa bb 5

What conclusion can be made about the arrangement of the genes on the chromosome in the Aa Bb parent?

The genes are ___________, and the map distance between them is ____________.
A. unlinked; 0 map units
B. in coupling configuration; 5 map units
C. in repulsion; 10 map units
D. in coupling configuration; 10

Genes a, b and c are recessive. Females heterozygous at these three loci were crossed to phenotypically abc males. The numbers of progeny recovered in each phenotypic class are shown below (+ represents the wild-type allele of each locus):

+ + + 13

a b c 10

+ + c 58

+ b + 0

a + + 424

a b + 67

a + c 1

+ b c 427

A) What is the order of the three genes?

ANSWER ALL the PARTS you can

PART1 Alleles are considered linked if recombination is less than 50% in:

a) a Px P Fl cross

b) an F1 x F1F2 cross

c) an F2 x F2F3 cross

d) an Fl x homozygous recessive cross

e) any F2 progeny x homozygous recessive cross 1.

PART2 If two loci A/a B/b are 9 map units apart, and an Ab/aB individual is testcrossed,

a) There will be 9% AB individuals

b)There will be 91% Ab individuals

c) There will be 4.5% ab individuals

d) There will be 91% recombination individuals

If two genes a and b show 50% recombination genes a and c show 35% recombination, and genes b and show 32% recombination, then

a) Genes a and b are on the same chromosome, and 50 m.u. apart

b) Genes a and b are on different chromosomes

c)Genes a and b are on the same chromosome, and 67 map units apart

d) One cannot tell if genes a and b are on the same or different chromosomes from given data.

PART4 If two genes a and b are 8.3 m.u. a part, one expects to find

a) 8.3% recombinant gametes from a double heterozygous parent

b) 91.7% recombinant gametes from a double heterozygous parent

c) A chiasma between the a and b loci in 8.3% of the meiosis

d) A chiasma between the a and b loci in 91.7% of the meiosis.

PART5 Map distances are most accurate when genes are closely linked because as genes become further apart,

a) They always show independent assortment

b)The chance of multiple crossovers increases

c) They no longer recombine

d) There is chiasma interference

PART6 In a three-point testcross, the most frequent classes of progeny were ABc and abC. The less frequent classes of progeny were AbC and aBc. Which gene is in the middle?

a) Aa

b) B/b

c)C/c

d) It is not possible to tell from just these data

PART7 In a three-point testcross with 100 progeny, there were 16 single crossovers between genes A and B, 29 single crossovers between genes B and C, and 4 double crossovers. The correct gene order was determined to be A-B-C. What is the map distance between A and B?

a) 20%

b) 0.2 m.u

c) 20 m.u.

d) 16 m.u.

e) 29 m.u.

f) 16%

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