Say two deleterious alleles, Abad andBbadder , are fairly close to one another on the same...
Say two deleterious alleles, Abad andBbadder , are fairly close to one another on the same chromosome. Describe/illustrate how only oneof the two deleterious alleles are transmitted to the next generation as opposed to both of them
Homework Answers
Linkage = Transfer of two loci
together which are located closely to each other into gametes
Genes that are closely placed on the chromosome move as a single
unit during gametogenesis.
The only way two linked genes can be separated is by crossing
over/recombination.
Crossing over/recombination is the exchange of genetic material
between two non-sister chromatids of the homologous pair of
chromosomes.
Two linked genes can also be separated by translocation.
Translocation refers to the translocation of a genetic segment to
another non-homologous region.
It can also occur by transposition.
It is given that Abad and Bbadder genes
both are linked i.e. located closely on the same chromosome.
So, they will be inherited together into a single gamete most of
the times.
The only way both of them can be separated is by crossing over i.e. recombination breakpoint should be in between them so that one gene goes into one chromosome and the other into the other chromosome.
Transposition also can separate both these genes. However, it moves
genes to a non-homologous region as compared to the crossing
over.
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