Mendelian Genetics (3)

Question 1

mutant alleles

Answer 1

may produce a phenotype different from that of the wild type (pupular) allele

Question 2

what are Pleiotropic alleles ?

Answer 2

single alleles with more than 1 distinguishable phenotypic effect

Question 2

what are Pleiotropic alleles ?

Answer 2

single alleles with more than 1 distinguishable phenotypic effect

Question 3

Epistasis

Answer 3

alleles of 1 gene cover up or alter expression of alleles of another gene

Question 3

Epistasis

Answer 3

alleles of 1 gene cover up or alter expression of alleles of another gene

Question 4

2 genes are mutually dependent

Answer 4

expression of each depends on alleles of other called complementary genes

Question 4

2 genes are mutually dependent

Answer 4

expression of each depends on alleles of other called complementary genes

Question 5

When does epistasis occur ?

Answer 5

1. whenevr 2 or more loci interact to create new phenotypes
2. whnever an allele at one locus masks the effects of alleles at one or more other loci
3. Whenever an allele at one locus modifies the effects of alleles at one or more other loci

Question 5

When does epistasis occur ?

Answer 5

1. whenevr 2 or more loci interact to create new phenotypes
2. whnever an allele at one locus masks the effects of alleles at one or more other loci
3. Whenever an allele at one locus modifies the effects of alleles at one or more other loci

Question 6

can temperature affect phenotype ?

Answer 6

Yes
e.g. Evening primrose produces red flowers at 23oC and white flowers at 18C

Question 7

what is penetrance ?

Answer 7

proportion of individuals in a group with a given geneotype thta actually show the expected phenotype

Question 8

what is expressivity ?

Answer 8

degree to which a genotype is expressed in an indivudual