Punnett Square By Mrs. Henning NOHS 2012

Simple Dominance Dominant Alleles Represent with a capital letter If the dominant allele is present, it always shows up. Recessive Alleles Represented with a lowercase letter Only shows up if there are NO dominant alleles Example: Red is dominant to white. R= Red r = white RR = Red Rr = Red rr = White

Genotypes and Phenotypes Genotype refers to the alleles present. Genotypes can be Homozygous dominant (HH) Heterozygous (Hh) Homozygous recessive (hh) Phenotype refers to the outward appearance of those alleles. Red hair, brown eyes, white fur, etc.

What is it called? BB Bb bb Yy CC Dd TT ee Pp EE Homozygous Dominant Heterozygous Heterozygous Homozygous Dominant Homozygous Recessive Homozygous Recessive Heterozygous Heterozygous Homozygous Dominant Homozygous Dominant

What will the genotype and phenotype be? B = Blue b = White BB Bb bb Homozygous Dominant Heterozygous Homozygous Recessive Blue Blue White

What will the phenotype be? R = Red r = Yellow RR Rr rr Homozygous Dominant Heterozygous Homozygous Recessive Red Yellow Red

Dominant Alleles American Curled Cat Curled Ear is Dominant EE or Ee Normal Ears is Recessive ee

If you have a normal eared cat and mated it with a heterozygous American Curled cat, how likely are you to have kittens with curled ears? E = Curled Ears e = Normal Ears Normal Ears Heterozygous Parent Genotype = ee x Ee

e e E E e E e e e e e e Put One Genotype Here And the other one here Parent Genotype: Ee x ee Put One Genotype Here e e E E e E e And the other one here e e e e e

e e E e E e e e Remember: E = Curled Ear e = Normal (straight) Ear Genotype: Ee ee Phenotype: Ee = ee = E e e e E 2 2 e 2 Ee : 2 ee 1 Ee : 1 ee Curled Ears Normal (Straight) Ears 2 Curled Ears : 2 Normal Ears 1 Curled Ears : 1 Normal Ears

Make sure to answer the question! If you have a normal eared cat and mated it with a heterozygous American Curled cat, how likely are you to have kittens with curled ears? E e e e How many will have curled ears? 2 out of how many 2 out of 4 = 50% chance

Folded Ears are dominant to normal ears Scottish Fold F = Folded Ears f = Normal Ears Folded Ears are dominant to normal ears

If you have two heterozygous cats for folded ears, what is the chance of having kittens with normal ears? F = Folded Ears f = Normal Ears Heterozygous Parent Genotype = Ff x Ff

F f F F F F f f f F f f Put One Genotype Here And the other one here Parent Genotypes: Ff x Ff Put One Genotype Here F f F F F F f And the other one here f f F f f

F f F F F f f f F f Remember: F = Folded Ear f = Normal (straight) Ear Genotype: FF Ff ff F F F f f f F 1 Folded Ears 2 Folded Ears Normal (Straight) Ears 1 f What is the chance of getting normal ears? Phenotypic Ratio 3 Folded: 1 Normal Normal Ears ¼ = 25%

Alleles: R r Parent Genotype: A heterozygous round pea is crossed to a homozygous wrinkled pea. What are the possible phenotypes and genotypes of the offspring? Alleles: R r Parent Genotype: = Round = Wrinkled Rr x rr