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Name: _________________________________ Date: ___________________ Period: ________ Dihybrid Cross Directions: As you know, the inheritance of any given set of alleles depends on chance. Therefore, the laws of probability can be used to predict the genotypes and phenotypes of offspring resulting from specific crosses. In this activity, you will use problem solving skills to complete the different Dihybrid crosses. Remember that in a dihybrid corss you are looking at two separate traits. A. In Rabbits: Black hair is dominant = B Blond hair is recessive = b Curly hair is dominant = C Straight hair is recessive = c 1. If the female rabbit is homozygous dominant for both traits, what is her genotype? _________________________________________________________________ 2. If the male rabbit is heterozygous for both traits, what is his genotype? _________________________________________________________________ B. In Pea Plants: Green pods are dominant = G Yellow pods are recessive = g Tall plants are dominant = T Short plants are recessive = t 1. If a pea plant is heterozygous for both traits, what is its genotype? __________________________________________________________________ 2. If a pea plant is homozygous dominant for both traits, what is its genotype? _________________________________________________________________ C. In Pea Plants: Round seeds are dominant = R Wrinkled seeds are recessive = r Yellow seeds are dominant = Y Green seeds are recessive = y 1. If a pea plant is heterozygous for both traits, what is its genotype? _________________________________________________________________ 2. If a pea plant is homozygous dominant for both traits, what is its genotype? _________________________________________________________________ D. In people Black hair is dominant (B) over blond hair (b). Curly hair is dominant (C) over straight hair (c). Complete the punnet square if both parents are heterozygous for both traits. BbCc x BbCc Genotype ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ Name: _________________________________ Date: ___________________ Period: ________ Phenotype ____________ & ___________ = ______ ____________ & ___________ = ______ ____________ & ___________ = ______ ____________ & ___________ = ______ E. In rabbits brown eyes (B) and straight ears (S) are dominant Pink eyes (b) and floppy ears (s) are recessive 1. If the male is homozygous dominant for both traits: a. What is his genotype? ____________ b. what is his phenotype? ____________ 2. If the female is homozygous recessive for both traits: a. What is her genotype? _____________ b. What is her phenotype? ___________ Genotype ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ Phenotype ____________ & ___________ = ______ ____________ & ___________ = ______ ____________ & ___________ = ______ ___________ _& ___________ = ______ Name: _________________________________ Date: ___________________ Period: ________ E. In the punnet square below set up a cross between two pea plants, each of which is heterozygous for both traits. R= Dominant allele for round seeds r= Recessive allele for wrinkled seeds L= Dominant allele for long stems l= Recessive allele for short stems ______________________ x _________________________ Genotype ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ Phenotype ____________ & ___________ = ______ ____________ & ___________ = ______ ___________ & ____________ = ______ ___________ & ____________ = ______ F. In the punnett square below set up a cross between 2 pea plants that are heterozygous for both traits. Green pods (G) are dominant over yellow pods (g). Tall stems (T) are dominant over short stems (t). Genotype ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ ______________ = _____ Phenotype ____________ & ___________ = ______ ____________ & ___________ = ______ ___________ & ____________ = ______ ___________ & ____________ = ______
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