Genetics Problems p Monohybrid p Dihybrid Selected Traits

Genetics Problems p. Monohybrid p. 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 1 HH : 2 Hh : 1 hh Phenotypic ratio: 3 Short Hair: 1 Long Hair 0 r 75% short Hair: 25% Long Hair

Cats #2 Heterozygous Tabby x Stripeless Tt x tt T t t Tt tt Genotypic ratio: Phenotypic ratio: 2 Tt : 2 tt or 50% Tt : 50% tt 2 Tabby : 2 Stripeless 0 r 50% Tabby: 50% Stripeless

Cats #3 Colorpoint x Homozygous Normal nn x NN n n N Nn Nn Genotypic ratio: 4 Nn or 100% Nn Phenotypic ratio: 4 Normal markings 0 r 100% Normal markings

Cats #4 Homozygous short/homozygous colorpoint x homozygous long/ homozygous normal Hn h. N Hh Nn Hn Hh Nn HHnn x hh. NN Phenotypes 16 - Short hair Normal markings Or 100% - Short hair Normal markings h. N

Cats #5 Heterozygous Short/heterozygous normal x Heterozygous Short/heterozygous normal HN Hn HN HH Nn Hn HH Nn HH nn h. N Hh NN hn Hh Nn Hh nn h. N hn Hh NN Hh Nn Hh nn hh NN hh Nn hh nn Hh. Nn x Hh. Nn Phenotypes 9 Short/Normal 3 Short/Colorpoint 3 Long/Normal 1 Long/Colorpoint

Cats #6 Heterozygous Tabby/heterozygous normal x Stripeless/colorpoint Tt. Nn x ttnn TN tn tn Tt Nn Tn Tt nn t. N 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 hh. Nn x hh. Nn h. N hh NN hn hh Nn hh nn h. N hn hh NN hh Nn Phenotypes 12 Long-hair Normal hh nn hh Nn hh nn 4 Long-hair Colorpoint