Bellwork Monday 1/23 Come to tutorial if you have missing work or want to retake the test Quiz friday 1. What is the difference between alleles, traits,

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Presentation transcript:

Bellwork Monday 1/23 *Come to tutorial if you have missing work or want to retake the test *Quiz friday 1. What is the difference between alleles, traits, and genes? Agenda 1.Pass a few things back (don’t let me forget) 2.Discuss Punnett Squares 3.Practice with Punnett Squares 4.Short video if time

For Hair length, what gametes can dad give to the puppy? For hair length, what gametes can mom give to the puppy? Dad’s chromosomes Mom’s Chromosomes TraitDominantRecessive Hair LengthLong (L)Short (l) Hair TextrureWiry (W)Silky (w) Hair CurlinessCurly ( C)Straight ( c) Coat PatternSpotted (S)Solid (s)

TraitDominantRecessive Hair LengthLong (L)Short (l) Hair TextrureWiry (W)Silky (w) Hair CurlinessCurly ( C)Straight ( c) Coat PatternSpotted (S)Solid (s) 1.Find the letters that represents the alleles for the trait Ex: For the trait = ____________, the letters will be_________ 2. Write out the genotypes of the parents to show the cross Ex: Cross a heterozygous parent with a homozygous recessive parent _____ x ______ 3. Draw a Punnett Square and put the possible gametes of each parent on the top and side. (Remember to make uppercase and lowercase different) Punnett Square Notes 4. Complete the Punnett Square by filling in The genotypes of the possible offspring of The cross 5. Determine the ratio of genotypes: And the ratio of phenotypes: Hair LengthL and l L ll LlLl llll L ll L l l 1 Ll : 1 ll 1 Long : 1 short

TraitDominantRecessive Hair LengthLong (L)Short (l) Hair TextrureWiry (W)Silky (w) Hair CurlinessCurly ( C)Straight ( c) Coat PatternSpotted (S)Solid (s) 1. Ex: Cross two heterozygous curly parents. Find the genotype and phenotype ratios CcCc CcCc CCCc cc Cc x Cc Genotype ratio: Phenotype ratio: 1 CC : 2 Cc : 1 cc 3 Curly : 1 straight

Finally, the good stuff What advice did the geneticist give to the football kicker? “Punt-it Square”

TraitDominantRecessive Hair LengthLong (L)Short (l) Hair TextrureWiry (W)Silky (w) Hair CurlinessCurly ( C)Straight ( c) Coat PatternSpotted (S)Solid (s)

Genetics video wJYL6Yhttp:// wJYL6Y

Graphing Parents: 2 Curly Hair, 0 Straight Hair 1 Spotted Coat, 1 Solid Coat Puppies: 12 Straight hair, 4 Curly hair 6 Spotted coat, 6 Solid Coat

TraitDominantRecessive Hair LengthLong (L)Short (l) Hair TextrureWiry (W)Silky (w) Hair CurlinessCurly ( C)Straight ( c) Coat PatternSpotted (S)Solid (s)