Genetics

Question 1

What bases pair in DNA

Answer 1

A,T
C,G

Question 2

define homozygous

Answer 2

same allele on each of chromosome

Question 3

define heterozygous

Answer 3

different allele on each chromosome

Question 4

how many chromosomes do human cells contain

Answer 4

23 pairs (46)

Question 5

how many cells does meiosis produce

Answer 5

4 - half as many chromosomes as in original cell

Question 6

define co-dominance

Answer 6

some genes share phenotypic expression

Question 7

define genetic imprinting

Answer 7

sex specific chemical modification of gene so that alleles are unequally expressed depending on sex of parent carrying gene

Question 8

define polygenic

Answer 8

multiple genes responsible for a trait

Question 9

define multifactorial

Answer 9

genetic expression involving a complex interaction with the environment

Question 10

Name two autosomal recessive conditions

Answer 10

PKU
Cystic fibrosis

Question 11

define autosomal

Answer 11

not sex linked

Question 12

name two autosomal dominant conditions

Answer 12

huntington’s chorea
marfan’s syndrome

Question 13

name two sex-linked conditions

Answer 13

duchenne muscular dystrophy
colour blindness