Genetics Worksheet

Genetics Worksheet - GENETICS WORKSHEET Introduction and...

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GENETICS WORKSHEET Introduction and Simple Dominant/Recessive (Monohybrid crosses) 1. For each genotype below, indicate whether it is heterozygous (He), Homozygous Dominant (HD) or Homozygous Recessive (HR) AA _______ Ee ________Jj ________ kk __________ oo _______ Bb _______ ff _________ HH ________ Pp __________ LL ________ 2. For each of the genotypes below determine what phenotypes would be possible. A. Purple flowers are dominant to white flowers PP__________ Pp ____________ pp _____________ B. Round seeds are dominant to wrinkled seeds RR ________ Rr ____________ rr ______________ There are five basic steps to solving a heredity problem. They are: 1. determine the genotype of each parent 2. determine all the possible gametes each parent can produce 3. determine all the possible offspring combinations that may result when their gametes combine 4. determine the phenotypes possible by analyzing the various genotypes 5. show all of your work and always be sure that you can explain your answers Determining Gametes 3. If an organism has the following genotypes, how many different types of sex cells can be produced? AaBb_____________ AabbCCdd ___________ AaBbCcDd ________________ 4. What are the possible gametes produced by individuals with the following genotypes? AaBb _________ AABBCc __________
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5. Set up the Punnet squares for each of the crosses listed below. Round seeds are dominant to wrinkled seeds. A= RR X rr gametes from RR parent _________ gametes from rr parent _________ Punnett Square: What percentage of the offspring will be round? ____________ B= Rr X rr gametes from Rr parent __________ gametes from rr parent __________ Punnett Square: What percentage of the offspring will be round? _______________ Practice with crosses. Show all work! 6. A true breeding (t.b.) tall plant is crossed with a t.b. short plant. Parental genotypes? _____________ Punnett Square What percentage of the offspring will be tall? ___________ 7. Two heterozygous tall plants are crossed. Parental genotypes? _____________ Punnett Square What percentage of the offspring will be short? ___________
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8. A heterozygous round seeded plant is crossed with a homozygous round seeded plant. Parental genotypes? _____________ Punnett Square What percentage of the offspring will be homozygous dominant? ___________ 9. A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. Parental genotypes? _____________ Punnett Square What percentage of the offspring will be homozygous? ___________ 10. In pea plants, purple flowers are dominant to white flowers. Cross two white flowered plants.
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Genetics Worksheet - GENETICS WORKSHEET Introduction and...

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