In a Soay sheep population linkage disequilibrium is complete between the TYRP18
ID: 98871 • Letter: I
Question
In a Soay sheep population linkage disequilibrium is complete between the TYRP1869 gene locus (T) and the presence of a microsatellite marker BMS678 "b". If the marker absence is "B" then what must be true of this Soay sheep population?
The TRYP1869 locus and the marker b are on different chromosomes
If you detect that a sheep has the b marker you cannot be confident that the plant also has a T allele
The recombination frequency between T and b is 50%
An equal number of TB ; tB; Tb and tb chromosomes will be found in the population
Selection for the t allele will also select for chromosomes that are B at the marker locus
a.The TRYP1869 locus and the marker b are on different chromosomes
b.If you detect that a sheep has the b marker you cannot be confident that the plant also has a T allele
c.The recombination frequency between T and b is 50%
d.An equal number of TB ; tB; Tb and tb chromosomes will be found in the population
e.Selection for the t allele will also select for chromosomes that are B at the marker locus
Explanation / Answer
Answer:
a. The TRYP1869 and the marker b are on different chromosomes.
Because linkage disequilibrium indicates the unexpected non-random linkage of alleles of genes, mostly due to evolutionary forces, which may or may not be present at the same loci i.e. they may not necessarily be linked.
Not b. because T and b are always inherited together since they have complete linkage equilibrium.
Not c. Because they need to be unlinked and present on the same chromosome for that.
Not d. Equal number is what is expected while linkage disequilibrium would cause T and b together to be favoured more over other allelic combinations.
Not e. T and b are in linked disequilibrium and not T and B.