In a newly discovered species of Giant Pacific Octopus, long tentacles (L) are dominant to short tentacles (l), strong suction cups (S) are dominant to weak suction cups (s), and brown body color (B) is dominant to red body color (b).  A trihybrid test cross was performed between male octopuses that were heterozygous for all three genes, and female octopuses that were homozygous recessive. (You may assume that the dominant alleles exhibit complete dominance.)  The results of this cross are shown in the table attached a) If the three genes are linked, draw a diagram that shows the correct orderof the three genes on the chromosome (with respect to which gene is in the middle) and also LABEL Region I and Region II on your diagram.   b) Calculate the map distances between each of the three genes. Please show the formula used for each calculation, and show ALL calculations. Define which region is your region I and which region is your region II. (For example, please state the region I is between genes x and y, and region II is between genes y and z.)

Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter13: Modern Understandings Of Inheritance
Section: Chapter Questions
Problem 11RQ: The genotype XXY corresponds to Klinefelter syndrome Turner syndrome Triplo-X Jacob syndrome
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In a newly discovered species of Giant Pacific Octopus, long tentacles (L) are dominant to short tentacles (l)strong suction cups (S) are dominant to weak suction cups (s), and brown body color (B) is dominant to red body color (b).  A trihybrid test cross was performed between male octopuses that were heterozygous for all three genes, and female octopuses that were homozygous recessive. (You may assume that the dominant alleles exhibit complete dominance.)  The results of this cross are shown in the table attached

a) If the three genes are linked, draw a diagram that shows the correct orderof the three genes on the chromosome (with respect to which gene is in the middle) and also LABEL Region I and Region II on your diagram.  

b) Calculate the map distances between each of the three genes. Please show the formula used for each calculation, and show ALL calculations. Define which region is your region I and which region is your region II. (For example, please state the region I is between genes x and y, and region II is between genes y and z.)

Phenotype
Long, weak, brown
Long, strong, brown
Short, strong, red
Short, weak, red
Long, strong, red
Long, weak, red
Short, weak, brown
Short, strong, brown
TOTAL
Number
292
153
286
139
42
16
46
12
986
Genotype
(Written in linkage
phase format)
(xyz/xyz)
P, SCO I, SCO II, or
DCO?
TET-7
Transcribed Image Text:Phenotype Long, weak, brown Long, strong, brown Short, strong, red Short, weak, red Long, strong, red Long, weak, red Short, weak, brown Short, strong, brown TOTAL Number 292 153 286 139 42 16 46 12 986 Genotype (Written in linkage phase format) (xyz/xyz) P, SCO I, SCO II, or DCO? TET-7
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