Mendel and beyond STUDY GUIDE

# Both are caused by recessive genes multiplication

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both are caused by recessive genes ) Multiplication Rule Dihybrid Ratios if both are heterozygous (memorize) Genotypic ratio – 1:2:2:4:1:2:1:2:1 Phenotypic ratio- 9:3:3:1

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Mendelian Genetics or Complete Dominance 1. In pea plants the color green (G) is dominant to the color yellow (g). Complete the following problems using Punnett squares and indicating the genotypes and phenotypes. A. Cross between two heterozygous pea plants. Genotype: Phenotype: Incomplete Dominance : 2. In snapdragons R represents Red and r represents white and Rr represents Pink Complete the following crosses below A. Red x White Genotype: Phenotype: 3. Codominance : Spotted- RR Striped – rr Spotted and Striped (mottled) – Rr Cross a spotted whodit with a mottled whodit. What are the geno/pheon ratios?
4. Sex Linked xx- female xy- male In flies red eyes R are dominant to white eyes r. If a male with white eyes mates with a female who is heterozygous for red eyes, do any of their children have white eyes? 5. Complete Dominance/Codominance In Velociraptors, Demeanor - Aggressive (A) is dominant to non-aggressive Skin Color - Red (R) is dominant to green. The third characteristic follows the rules for codominance: The homozygous traits are striped and spotted The heterozygous type is a combination of striped and spots called mottled . a. Cross a male raptor that is heterozygous for three traits with a striped female that is heterozygous for skill color and is non-aggressive _____________________________ x_________________________________ b. What is the probability of producing a male raptor that is red, aggressive and mottled from the cross above? (Hint: remember that the probability of producing a male or a female is always ½)

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