In a series of two-point crosses involving three genetically linked genes (the P

Question

In a series of two-point crosses involving three genetically linked genes (the P,R, and T genes), the following linkage data were obtained: linkage between genes R and P: 15.4 cM linkage between genes R and T: 22.4 cM linkage between genes P and T: 7.2 cM These data tell us that the order of genes on the chromosome is RPT In a three-point cross between a triple heterozygote (AaBbCc) and a homoygous recessive parent (aabbcc), the following gamete frequencies were observed from the triple heterozygote: Which of the following gametes is a parental (non-recombinant) gamete? One map unit equals 1 % recombination, and is also 1 centiMorgan (cM) In a two-point cross between AaBb and aabb, the following offspring were obtained: Which of the following is NOT true? AaBb is a recombinant offspring C The A and B genes are 25 cM apart C The two genes are located on the same chromosome C One homolog in the heterozygous parent had the A and B alleles, and the other homolog in this parent had the a and b alleles If you have three genes that you are trying to map genetically, you could either use a three-point cross or a series of two-point crosses.

Explanation / Answer

1. TRUE

R-------------------P----------- -T

           15.4 cM       7.2 cM

Q2.) b. ABc is one of the parental gamet (abC is the other parental gamete)

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