Question

Question 24

How does position effect influence gene expression?

		Point mutations in promoters frequently occur by this mechanism
		Since this mechanism relies on recombination it relies on the positioning of one allele so that it is under the control of the other allele
		Translocations may result in a promoter that is normally used for one gene now controlling an entirely different gene
		Translocations always result in a gene being recombined into an area of heterochromatin

Question 26

A new gene is produced through non-homologous recombination during crossing over

		Genetic drift
		Exon shuffling
		Horizontal gene transfer
		Migration

Answer 1

25) d) Translocation always result in gene being recombined in a area of heterochromatin.

Explanation- It is a mechanism by which expression of gene get altered due to its translocation. It is most studied in drosophila for eye colour. In case these trnslocation gene which translocate get it expression altered due to activity of gene near by or gene may reside in area with heterochromatin which has ability to halt expression of gene.

26) Exon shuffling

Explanation- it is mechanism of formation of new gene during crossing over of parental genomes during sexual recombination.

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