ged 9

Question 1

what is a silent mutation

Answer 1

doesn’t affect the encoded acid

Question 2

what is a nonsense mutation

Answer 2

coden changed to a stop codon so we get truncated protein

Question 3

what is a missense mutation

Answer 3

we get a different amino acid as codon has changed

Question 4

wild type

Answer 4

functional protein normal

Question 5

are LOF genes recessive or dominant

Answer 5

recessive

Question 6

is GOF allele recessive or dominant

Answer 6

dominant

Question 7

what is incomplete dominance

Answer 7

the heterozygote phenotype is intermediate between the two homozygote phenotypes

Question 8

what is co dominance

Answer 8

heterozygotes show phenotype of both alleles eg blood groups

Question 9

multiple alleles

Answer 9

may be more than two alleles for a single gene eg dominance series A> a^t>a

Question 10

what is pleiotropy

Answer 10

when one gene may influence more than one trait eg lethal alleles control the colourof fur and the viability

Question 11

what does lethality cause

Answer 11

skewed phenotypic ratios

Question 12

achondroplasia is lof or gof

Answer 12

gof cuases premature replacement of cartilage with bone

Question 13

lethal alleles tend to be

Answer 13

homozygous recessive