Simpsons genetics problems worksheet answer key

Genetics problem worksheet for Learning Teams, biology homework help
Subject
Science

Question Description
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The assignment is the sheet titled "Simple Genetics Practice Problems". There are fifteen problems. Complete 1 - 9 and choose which three from 10-15 to submit. Scanned work as a pdf file is acceptable (it is difficult to type out punnet squares and the math required to show the probabilities).Mendelian genetic principles. In a certain plant species, rough seeds (R) are dominant over smooth seeds (r). Using the following Punnett squares, predict the genotypes and phenotypes of the offspring whose parents are both heterozygous (Rr). R r R RR Rr r Rr rr Genotypes: _25_% homozygous rough seeds (RR) __50% heterozygous rough seeds (Rr) _25_% homozygous smooth seeds (rr) Phenotypes _75_% rough seeds _25_% smooth seeds In the following Punnett square, predict genotypes and phenotypes if one parent is homozygous rough and the other parent is homozygous smooth. R R r Rr Rr r Rr Rr Genotypes: _0__% homozygous rough seeds (RR) 100__% heterozygous rough seeds (Rr) __0__% homozygous smooth seeds (rr) Phenotypes _100_% rough seeds __0_% smooth seeds In the following Punnett square, predict genotypes and phenotypes if one parent is heterozygous rough and the other parent is homozygous smooth. R r r Rr rr r Rr rr Genotypes: _0__% homozygous rough seeds (RR) __50% heterozygous rough seeds (Rr) _50_% homozygous smooth seeds (rr) Phenotypes _50___% rough seeds __50__% smooth seeds Domain 1 Mendelian Genetics Practice Genetics Practice Problems 1. For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho) AA _____ Bb _____ Cc _____ Dd _____ Ee _____ ff _____ GG _____ HH _____ Ii _____ Jj _____ kk ____ Ll ____ Mm _____ nn _____ OO _____ Pp _____ 2. For each of the genotypes below determine what phenotypes would be possible. Purple flowers are dominant to white Brown eyes are dominant to blue PP _____________ Pp _____________ pp ______________ BB ___________ Bb ____________ bb _____________ Round seeds are dominant to wrinkled Bobtails are recessive (to long tails) RR ______________ Rr ______________ rr _______________ TT ____________ Tt ____________ tt _____________ 3. For each phenotype below, list the genotypes (remember to use the letter of the dominant trait) Straight hair is dominant to curly Tail spikes are dominant to plain tails _____ straight ____ spikes _____ straight ____ spikes _____ curly ____ plain 4. Set up the Punnet squares for each of the crosses listed below. Round seeds are dominant to wrinkled. 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? _______ Practice with Crosses. 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? ______ What percentage is tall? _______ 7. A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous (RR)? _______ 8. A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What are the genotypes of the parents? __________ x __________ What percentage of the offspring will also be homozygous? What is the genotype of all of the offspring? ________ ________ 9. In pea plants purple flowers are dominant to white flowers. If two white flowered plants are cross, what percentage of their offspring will be white flowered? ______________ 10. A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the offspring will have purple flowers? _____________ 11.