Gene Linkage Map
Not what you're looking for?
Three recessive mutations in DROSOPHILA cause black body color(b), dumpy wings(dp), and hooked bristles(hk). From a cross of dumpy female with a black, hooked male, all the F1 were wild type for all three characters. The testcross of an F1 female with a dumpy, black, hooked male gave the following phenotypic results:
wild type 169
black 19
black, hooked 301
dumpy, hooked 21
hooked 8
hooked, dumpy, black 172
dumpy, black 6
dumpy 304
Construct a linkage map of the three genes indicating the gene order and distance between each.
Purchase this Solution
Solution Summary
How to develop a linkage map when you only know the proportions of phenotypes
Solution Preview
Parents:
Female: B dp HK
B dp HK
Male: b DP hk
b DP hk
How do we know this? Because the F1 were all wildtype for each characteristic, it means the parents must have been homozygous for each gene, otherwise crossing over would of led to a small number of F1 offspring with on or more recessive characteristics.
So, the F1 generation are all: B dp HK
b DP hk
Now, cross female F1: B dp HK
b DP hk
with male: b dp hk
b dp hk
The unrecombined offspring ...
Purchase this Solution
Free BrainMass Quizzes
Cellular Respiration
This quiz is a review for cellular respiration.
Biochemistry Basics
A refresher quiz to test your knowledge of basics concepts of biochemistry.
How Well Do You Know Your Body?
This quiz will assess the different systems of the human body. It will examine everything from the organs to the cellular processes that occur.
Infant Development: Sleep
How much do you know about infant sleep? Test your knowledge with this quiz.
How Much Do You Know About Genetic Inheritance?
Most of us studied the basics of dominant and recessive genes at some point. However, genetics are much more complicated than this. How far beyond the basics does your knowledge go?