Lecture 7

Question 1

What is inheritance

Answer 1

behaviour of genes at the level of the organism

Question 2

Laws of inheritance

Answer 2

law of dominance and uniformity
law of segregation
law of independent assortment

Question 3

Generations

Answer 3

parents- true breeding

first filial generation F1

Second filial generation F2

Question 4

Law of dominance and uniformity

Answer 4

some alleles are dominant over others

if one allele is dominant then it will determine the phenotype

Question 5

Law of segregation

Answer 5

during gamete formation the alleles will segregate so each gamete contains only1 allele

Question 6

true-breeding parents

Answer 6

have 2 identical alleles

Question 7

F1 one of a dominant and recessive true breeding parents

Answer 7

all heterozygous

Question 8

F2 of true breeding parents

Answer 8

3:1 phenotypic ratio
1:2:1 genotypic ratio

Question 9

Test cross

Answer 9

as homozygous dominant and heterozygous have the same phenotype this is used to test for genotype

cross breed the individual with a recessive homozygous individual

if F1 has recessive phenotype then they are heterozygous

Question 10

Dihybrid cross

Answer 10

when you look at two characteristics in the same cross

Question 11

Law of independent assortment

Answer 11

each pair of alleles separates indepedently of another pair of alleles into the gametes