Genetics 2

Question 1

What does a dihybrid cross show

Answer 1

the inheritance of 2 characteristics

Question 2

2 examples of characteristics passed down

Answer 2

hight and colour of plants

Question 3

2 common ratios for dihybrid crosses

Answer 3

9: 3:3:1
1: 1:1:1

Question 4

2 reasons why the normal ratios wouldn’t be the answer

Answer 4

if the genes are linked (6th year)

if there is co-dominance ( incomplete dominance )

Question 5

name of medel’s second law

Answer 5

The law of independant assortment

Question 6

The law of independant assortment (mendels second law)

Answer 6

when gametes are formed, each member of a pair of alleles can be inherited with any one from another allele pair

Question 7

why would traits not be linked and can be combined at random

Answer 7

if they are located on different sets of homologous chromosomes

Question 8

when would there be a 9:3:3:1 ratio for a dihybrid cross

Answer 8

2 heterozygous parents

Question 9

when would there be a 1:1:1:1 ratio for a dihybrid cross

Answer 9

1 heterozygous and 1 homozygous parent