Transcript Genetics Problems

Genetics Problems
Monohybrid
Dihybrid
Selected Traits In Cats
Trait
Dominant Allele
Recessive Allele
Coat
Length
Short hair
(H)
Long hair
(h)
Tabby
stripes
Tabby
(T)
Stripeless
(t)
Markings
Normal
(no colorpoint)
(N)
Colorpoint
(n)
Coat Length
Short Hair
Long Hair
Tabby Stripes
Tabby
Stripeless
Markings
Normal (no colorpoint)
Colorpoint
Cats #1
Heterozygous short-hair x Heterozygous short-hair
Hh x Hh
H
H
h
Genotypic ratio:
h
HH
Hh
Hh
hh
1HH : 2Hh : 1hh
Phenotypic ratio: 3 Short Hair: 1 Long Hair 0r
75% short Hair: 25% Long Hair
Cats #2
Heterozygous Tabby x Stripeless
Tt x tt
T
t
t
Tt
tt
t
Tt
tt
Genotypic ratio:
Phenotypic ratio:
2Tt : 2 tt or 50% Tt : 50% tt
2 Tabby : 2 Stripeless 0r
50% Tabby: 50% Stripeless
Cats #3
Colorpoint x Homozygous Normal
nn x NN
n
n
N
Nn
Nn
N
Nn
Nn
Genotypic ratio:
4 Nn or 100% Nn
Phenotypic ratio:
4 Normal markings 0r
100% Normal markings
Cats
#4
Homozygous short/homozygous colorpoint x
homozygous long/ homozygous normal
Hn
hN
hN
Hh
Nn
Hn
Hh
Nn
Hn
Hh
Nn
Hn
Hh
Nn
HHnn x hhNN
Phenotypes
16 - Short hair
Normal markings
Or
100% - Short hair
Normal markings
hN
hN
Cats
#5
Heterozygous Short/heterozygous normal x
Heterozygous Short/heterozygous normal
HN
Hn
HN
HH
NN
HH
Nn
Hn
HH
Nn
HH
nn
hN
Hh
NN
hn
Hh
Nn
Hh
Nn
Hh
nn
hN
hn
Hh
NN
Hh
Nn
Hh
Nn
Hh
nn
hh
NN
hh
Nn
hh
Nn
hh
nn
HhNn x HhNn
Phenotypes
9 Short/Normal
3 Short/Colorpoint
3 Long/Normal
1 Long/Colorpoint
Cats
#6
Heterozygous Tabby/heterozygous normal x Stripeless/colorpoint
TtNn x ttnn
TN
tn
tn
Tt
Nn
Tn
Tt
nn
tN
tn
tt
Nn
tt
nn
Phenotypes
4 Tabby/Normal
4 Tabby/Colorpoint
4 Stipeless/Normal
4 Stripeless/Colorpoint
tn
tn
Cats
#7
Long-hair/heterozygous normal x Long-hair/heterozygous normal
hhNn x hhNn
hN
hN
hh
NN
hn
hh
Nn
hN
hh
NN
hn
hh
Nn
hn
hh
Nn
hh
nn
hh
Nn
hh
nn
hN
hn
hh
NN
hh
Nn
hh
Nn
hh
NN
hh
Nn
Phenotypes
12
Long-hair
Normal
hh
nn
hh
Nn
hh
nn
4
Long-hair
Colorpoint