Recombinant Mapping Curly Wings
Not what you're looking for?
If Curly wings are recessive to normal wings and Barred Eyes is recessive to normal eyes, cross Curly Barred to a normal normal fly. What would be the expected ratios if they were linked or unlinked? If you had 2,500 flies, how many would you expect to see?
Purchase this Solution
Solution Summary
The expected ratios of the links and unlinked recessive files are determined.
Solution Preview
Let us use + signs to indicate dominant alleles. In both of these genes, the dominant allele is the normal one.
Therefore, the curly wing allele can be designated as "c" whereas the normal wing allele can be designated as "c+".
Also, barred eyes allele can be designated as "b" and the normal eye allele as "b+".
A "curly:barred" fly would, therefore, be ccbb (double mutation). The fly is homozygous for both genes.
The "normal:normal fly" (herein called simply "normal" or "wild-type") would be c+c+b+b+.
Remember, wild-type doesn't mean "wild" and "bizarre". It just means that is the type found naturally "out in the wild," i.e. in nature. Sometimes, wild-type or normal is simply abbreviated as wt.
So, this is the cross:
ccbb x c+c+ b+b+
(When you write these out on your own, put the + sign as a superscript. It'll look better and make more sense visually.)
Each fly produces maximum amounts of gametes mixing and matching what it can (since these genes are "not linked" at this point -- see below).
The ccbb fly can produce only one type of gamete, cb.
Likewise, the c+c+b+b+ fly can produce only one type of c+b+.
Therefore, we set up the Punnett Square like this:
c+b+
cb c+c b+b
All the F1 would have the same genotype (c+c b+b). They would all have the ...
Purchase this Solution
Free BrainMass Quizzes
Do You Know Your Macromolecules?
This quiz will assess your knowledge of the macromolecules that are important to living things.
Vision and Oculomotor Control
This quiz will test the student's knowledge of the neural underpinnings of the visual system and its central pathways.
Basic Concepts in Neuroscience
This quiz provides a review of the basic concepts in neuroscience.
Light and Sight Vocabulary
This quiz introduces basic definitions of vocabulary related to light and how human eyes. This information is important for an understanding of sight.
Nerves and the Nervous System
This quiz will assess your knowledge of the nervous system and how nerves send signals around the body.