genetics_crosses

genetics_crosses - Todays Objectives TSW employ the four...

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Today’s Objectives TSW employ the four primary rules for solving genetics problems. TSW successfully solve genetics crosses involving one and two alleles. TSW successfully solve monohybrid and dihybrid crosses using the Punnett Square.
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Solving Crosses
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Steps for Solving a Genetics Problem: Trait – dominant = A (AA or Aa) Trait – recessive = a (aa) ___________ x ___________ Punnett Square Answer questions based on results from Punnett Square ____ ____ ____ ____
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Monohybrid Crosses Cross that involves one pair of contrasting traits Solve using Punnett Square Sample problems: Rr x rr RR x rr Rr x Rr Rr x RR
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Let’s Solve Together Short hair (L) is dominant to long hair (l) in mice. What is the genotype and phenotype ratio of a heterozygous short-haired mouse crossed with a long- haired mouse?
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Example 1: Monohybrid Short hair = dominant = L (LL or Ll) long hair = recssive = l Ll x ll (heterozygote parent = Ll) Punnett Square: Genotype ratio: ½ Ll: ½ ll Phenotype ratio: ½ short hair: ½ long hair L l l Ll ll l Ll ll
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genetics_crosses - Todays Objectives TSW employ the four...

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