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Rat Genetics

Learn about rat genetics, phenotypes, and genotypes through the breeding of black and gray hair-coated rats. Understand terms like heterozygous and homozygous while predicting offspring traits.

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Rat Genetics

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  1. Rat Genetics

  2. Male Rat (Dad) • Phenotype • Black Hair • Genotype • BB / Bb

  3. Female Rat (Mom) • Phenotype • Gray (shade of Black) Hair Coat • Genotype • BB / Bb

  4. Vocabulary Terms • Heterozygous: The 2 alleles for the trait are different ex. Bb 1 dominate & 1 recessive • Homozygous: The 2 alleles for the trait are the same ex. BB or bb 2 dominant or 2 recessive • Phenotype: Physical appearance • Genotype: Genetic traits (BB /Bb / bb)

  5. What will their offspring’s phenotype and genotype be if female is heterozygous dominant for black hair and the male is homozygous for black hair? • Female Male • Bb -BB • Offspring • Black Hair • White Hair • Homozygous • Heterozygous B b b B B B B 100% 0% 50% B B B b B 50%

  6. 1st Mating Offspring / F1 Generartion (babies) • 9 lived • Phenotype • 100% Black Hair Coat • Genotype • 100% BB / Bb

  7. What will their offspring’s phenotype and genotype be if male and female is heterozygous dominant for black hair? • Female Male • Bb -Bb • Offspring • Black Hair • White Hair • Homozygous • Dom. Rec. • Heterozygous B b B B B B b 75% 25% b B b b b 25% 25% 50%

  8. 2nd Mating / F2 Generation Offspring • phenotype • 75% Black Hair Coat • 25% White Hair Coat • Genotype • 75% BB / Bb • 25% bb

  9. So based on the phenotypes of the second mating offspring we now know…. • Both Female (mom) and Male (dad) genotype has to be.. • Bb Heterozygous Dominant for black hair

  10. Your Turn: Name: ___________ Per___ What would happen if you breed the white homozygous (bb) rat to an black homozygous rat (BB)? • Phenotype black ________% white ________ % • Genotype • ___ ______% • ___ ______% • Draw/Color picture to show Phenotype of offspring on back of this sheet

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