epistasis

Question 1

what is epistasis

Answer 1

when one gene modifies or masks the expression of a different gene at a different locus

Question 2

what is the epistatic gene

Answer 2

the gene that masks the expression of the hypostatic gene

Question 3

what is the hypostatic gene

Answer 3

the gene that is masked by the epistatic gene

Question 4

epistasis is an interaction between genes at …… loci
…… is an interaction between alleles at the same locus

Answer 4

different
codominance

Question 5

the …….. ……… genotype at the epistatic locus ……. the effect of the pair of alleles at the hypostatic locus

Answer 5

homozygous recessive
masks

Question 6

the …….. ………. or ………… ……….
genotype at the epistatic locus masks the effect of the pair of alleles at the hypostatic locus

Answer 6

epistatic gene
homozygous dominant

Question 7

what are 3 examples of epistasis?

Answer 7

• coat colour in mice
• coat colour in labradors
• fruit colour of vegetables

Question 8

example of epistasis using labradors

Answer 8

gene 1: controls whether pigment will be expressed
- allele E = dominant, codes for pigment production
- allele e = recessive, codes for no pigment production (always be yellow)

gene 2: controls which pigment is expressed
- allele B = dominant, codes for black fur
- allele B = recessive, codes for brown fur

• EeBb = brown fur
• eeBB = yellow
• EEbb = brown