Answer all 1 thorugh 6 question in your own words in 34 sent

Answer all 1 thorugh 6 question in your own words in 3-4 sentences. Do not not plagiarize direct from web-source.

1. You are working with a 125 million bp human chromosome (1 centimorgan 1 million bp), and wish to use markers to map new genes via linkage. In theory, what are the minimum number of markers/loci you need to map genes to this chromosome? Why? 2. A cross between X and Y yields 20% recombination. A cross between Y and Zshows 10% recombination. What do you need to know to determine the order of the genes with respect to one another? 3. Cross AaBbCc to homozygous recessive aabb (the gene order is not necessarily ABC). The recombination that is the lowest is with aaBbCc and Aabbcc. Which gene is in the middle? What does the phenotype Dominant A Recessive B Dominant C represent? Explain or show work. 4- Barbara McClintock and Harriet Creighton\'s experiment with corn, why is one of the crossover progeny highlighted in blue? Why is this progeny more useful in this experiment than all of the other noncrossover and crossover progeny? How else did they confirm it. 5- Why is linkage between two genes on the same chromosome from 50% to 100%, and not lower

Solution

Answer:

3).BbAaCc

AaBbCc produces 8 types of gametes, ABC, ABc, AbC, Abc, aBC, aBc, abC & abc.

If the Gene is A is middle, then only Abc & aBC will be the lowest gametes from the AaBbCc due to double crossover.

If we cross these gametes with abc gametes from aabbcc, the lowest genotypes are aaBbCc & Aabbcc

Hence, the middle gene is A.

As the gene A is middle, the phenotype will be bbA_C_. It represents a single crossover might be done between the gene b and a