Genetics and Punnett squares

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Presentation transcript:

Genetics and Punnett squares

Activity #1 Cross a purebred short pea plant with a hybrid tall pea plant (tt x Tt). What will the phenotype and genotype of the offspring be?

Activity #2 Cross a purebred tall pea plant with a hybrid tall pea plant (TT x Tt). What will the phenotype be and what %age of offspring will carry the recessive short gene?

Activity #3 Cross a hybrid tall pea plant with another hybrid tall pea plant (Tt x Tt). What will the phenotype and genotype be for the offspring?

Activity #4 Cross a purebred black guinea pig with a hybrid black guinea pig (BB x Bb). What % will be purebred black? What % will be hybrid black? What % will be white (bb)?

Activity #5 Cross a purebred tall wheat plant with a purebred short wheat plant (TT x tt). What is the genotype and phenotype of the offspring?

Activity #6 Fur traits in rabbits are as follows: Short hair (S) is dominant over Long hair (s) and Curley hair (C) is dominant over Straight hair (c). Cross a purebred Short and Curley haired rabbit with a purebred Long and Straight haired rabbit. What is the phenotype and genotype of the offspring? %ages?

Activity #7 Now let’s cross a Short hair hybrid – Curley hair purebred (SsCC) with a Short and Curley hair hybrid (SsCc). What are the genotype and phenotype? What %ages of each?

Activity #8 Working alone, cross a Long and Straight hair purebred rabbit (sscc) with a Short and Curley haired hybrid rabbit (SsCc).

Activity #9 Working alone, draw a Punnett square for a dihybrid cross (5 columns, 5 rows) on the bottom of the page. Cross a Short and Curley haired hybrid rabbit (SsCc) with a Short and Curley haired hybrid rabbit (SsCc). Find the different genotypes and the ratio of like phenotypes, whether homozygous or heterozygous.