#2 New Problem for 3 sex-linked genes. Triply heterozygous females were mated to triply mutant males and obtained the following results: (gene orders are not certain) a, b, c 35 a, +, + +, b, c +, b, + a, +, c 35 70 75 +, +, c a, b, + 385 400 a) Circle the parental genotypes. b) Box the double recombinants. c) Determine the order of the three loci on the X chromosome d) Estimate the gene distances between these alleles.

Biology: The Dynamic Science (MindTap Course List)
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Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter13: Genes, Chromosomes, And Human Genetics
Section: Chapter Questions
Problem 8TYK: Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene...
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Can I get an explanation for 1a, 1d, 1e, 2c, 2d and the calculations for the level of interference please.

144
#2 New Problem for 3 sex-linked genes.
Triply heterozygous females were mated to triply mutant males and obtained the
following results:
(gene orders are not certain)
+, +,
a, b, c
0.
35
a, +, +
+, b, c
+, b, +
35
70
75
385
a, +, c
+, +, c
a, b, +
400
a) Circle the parental genotypes.
b) Box the double recombinants.
c) Determine the order of the three loci on the X chromosome
d) Estimate the gene distances between these alleles.
at>b
at>c
#3 Calculate the level of interference using the genes above. (show your work)
For problem #1:
For problem #2:
Transcribed Image Text:144 #2 New Problem for 3 sex-linked genes. Triply heterozygous females were mated to triply mutant males and obtained the following results: (gene orders are not certain) +, +, a, b, c 0. 35 a, +, + +, b, c +, b, + 35 70 75 385 a, +, c +, +, c a, b, + 400 a) Circle the parental genotypes. b) Box the double recombinants. c) Determine the order of the three loci on the X chromosome d) Estimate the gene distances between these alleles. at>b at>c #3 Calculate the level of interference using the genes above. (show your work) For problem #1: For problem #2:
Genetics Assignment
Gene Linkage
march 24
#1 Determine order/distance for linked genes.
A Drosophila geneticist made a cross between females homozygous for three X-linked
recessive mutations (a, a short body; b, oblong eye shape; c, colored eyes) and wild-
type males.
a) List the genotypes and phenotypes for the F1 progeny. 4 ee
The F1 females were then mated to triply mutant males. Notice that this is just a cross
between the F1 progeny from above, and that the phenotype of the offspring will be
determined by the maternal gametic contribution. The phenotypic results for the F1
cross is as follows: (gene orders are not certain)
+, +, +
a, b, c
(a, +, +2
+, b, c
+, b, +
a, +, c
(+, +, c
a, b, +
400
385
70
69
5.
35
35
b) Circle the parental genotypes.
7c) Box the double recombinants.
d) Determine the order of the three loci on the X chromosome
e) Estimate the gene distances between these alleles.
atb
at>c
Transcribed Image Text:Genetics Assignment Gene Linkage march 24 #1 Determine order/distance for linked genes. A Drosophila geneticist made a cross between females homozygous for three X-linked recessive mutations (a, a short body; b, oblong eye shape; c, colored eyes) and wild- type males. a) List the genotypes and phenotypes for the F1 progeny. 4 ee The F1 females were then mated to triply mutant males. Notice that this is just a cross between the F1 progeny from above, and that the phenotype of the offspring will be determined by the maternal gametic contribution. The phenotypic results for the F1 cross is as follows: (gene orders are not certain) +, +, + a, b, c (a, +, +2 +, b, c +, b, + a, +, c (+, +, c a, b, + 400 385 70 69 5. 35 35 b) Circle the parental genotypes. 7c) Box the double recombinants. d) Determine the order of the three loci on the X chromosome e) Estimate the gene distances between these alleles. atb at>c
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