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.com/bbcswebdav/pid-22261 95-dt-content-rid-10721 540 1 /courses/1 1045.201 830/S18%20BIOLsa STUDY QUESTIONS for Chapter 7: Linkage, Recombination, and Eukaryotic Mapping 1. If 2 genes are linked, but not completely, what will you observe, in terms of progeny classes and numbers, when an individual who is heterozygous at both loci is crossed in a test cross? 2. If 2 genes are COMPLETELY linked, what will you observe when an individual who is heterozygous at both loci is crossed in a test cross? What does it mean to say 2 genes are completely linked? 3. If 2 genes are linked, recombination results from crossovers between the chromosomes these two loci are located during EVERY meiotic division. TRUE or FALSE? which 4. p'p b'b is the appropriate annotation to use to indicate that the p locus and the b locus are while p' b is the correct annotation to use to indicate that the p and b loci are p bExplanation / Answer
1-
1- suppose there are two genes which are A and B and their alleles are A,a and B, b
the cross between Ab/aB and ab/ab will give us -
major Progenies will be Ab/ab and aB/ab and minor progenies will be AB/ab and ab/ab
2-
suppose there are two genes which are A and B and their alleles are A,a and B, b
the cross between Ab/aB and ab/ab will give us -
Progenies will be Ab/ab and aB/ab.
Completely linked genes are the genes which cannot undergo recombination during the meiosis.
3- this statement is true. But the phenotype can only be seen if one of the parents is present in heterozygous condition individual.
4- a- non-linked or present at different chromosomes
B - Linked or present on the same chromosomes
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