Sci 9 Genetics Practice Problems

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  • 1. Science 9 Name: _______________________________ Date: __________________ Blk: _________Genetics Practice Problems1. For each genotype, indicate whether it is heterozygous (HE) or homozygous (HO) AA _____ Bb ______ Cc _______ DD _______ Ee _____ ff ______ Gg _______ hh ________2. For each of the genotypes below, determine the phenotype.Purple flowers (P) are dominant to white flowers (p). Brown eyes (B) are dominant to blue eyes (b).PP _____________________________________ BB ____________________________Pp _____________________________________ Bb ____________________________pp _____________________________________ bb ____________________________3. For each phenotype, list the genotypes.Curly hair (C) is dominant to straight hair (c). Tall plants (T) are dominant to short plants (t).___________________________ curly ____________________________ tall___________________________ curly ____________________________ tall___________________________ straight ____________________________ short4. Set up the Punnett square for each of the crosses listed below. The trait being studied isround seeds (dominant = R) and wrinkled seeds (recessive = r)Rr x rr What percentage of the offspring will be round? _____________________ _____Rr x Rr What percentage of the offspring will be round? _____________________ _____RR x Rr What percentage of the offspring will be round? _____________________ _____
  • 2. Practice with Crosses. Please show all work!5. A TT (tall) plant is crossed with a tt (short) plant. What percentage of the offspring will be tall?6. A Tt plant is crossed with a Tt plant. What percentage of the offspring will be short?7. In pea plants, purple flowers (P) are dominant to white flowers (p). If two white flowered plantsare crossed, what percentage of their offspring will be white flowered?8. A white flowered plant is crossed with a plant that is heterozygous for the trait. Whatpercentage of the offspring will have purple flowers?9. Two plants, both heterozygous for the gene that controls flower color, are crossed. Whatpercentage of their offspring will have purple flowers? What percentage will have white flowers?