GENETICS REVIEW SHEET Genetics - Arapahoe High School

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<strong>Genetics</strong> Problems:13. Name the 5 steps to follow when working any genetics problem:1.___________________________________________________2.___________________________________________________3.___________________________________________________4.___________________________________________________5.___________________________________________________COMPLETE DOMINANCE: One __________________ is completely ______________________ over the other.14. In pea plants, green (G) is dominant to yellow (g).a. A homozygous yellow plant would have what genes for this trait?b. What is the phenotype for a plant with the genotype Gg?c. If a homozygous green plant is crossed with a homozygous yellow plant, what genotypesand phenotypes would you expect the F1 generation to have?Punnett Square:Cross: ___________ X ______________Answer the Question:15. A cross between two heterozygous parents, where Blue (B) is dominant to white (b), what arethe phenotypic and genotypic ratios of the F1 generation?Cross: ___________ X _______________Punnett Square:Phenotypic Ratio: ___________ : ___________ (F1 generation)Genotypic Ratio: ________ : ________ : _________ (F1 generation)
Codominance:Occurs when both ___________________ for a gene are expressed in a ________________ offspring.16. In shorthorn cattle, when a red bull (RR) is crossed with a white cow (WW), all the offspringare roan—a spotted, red and white or milky red color.a. What are the chances of the offspring resulting in red cattle, when a roan bull is crossedwith a roan cow?Cross: _________________ X __________________Punnett Square:Answer the Question: There are three different ways to represent this answer.1. ___________________2. ___________________3. ___________________Dihybrid Cross: Cross involving _______________________ traits.17. In pea plants, the allele for round seeds (R) is dominant over wrinkled seeds (r), and the allelefor yellow seeds (Y) is dominant over the allele for green seeds (y).a. What are the results of a cross between two heterozygous round, yellow pea plants?Cross: ___________ X _____________Punnett Square:Results:Ratio: ** __________ : _________ : ___________ : ___________**
Page 1: Biology 2007: GeneticsName_________
Page 5: Multiple Alleles: Traits controlled

GENETICS REVIEW SHEET Genetics - Arapahoe High School

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