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Do Now

Do Now. Identify the heterozygous and homozygous alleles from below. Aa BB Bb Tt tt Kk Ll GG Oo ZZ. Announcements. GU plays tonight at 11 pm on ESPNU Homework tonight Quiz on Friday Progress Reports on Monday. Agenda. Bean Genes Lab Punnett Squares. Bean Gene Lab.

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Do Now

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  1. Do Now Identify the heterozygous and homozygous alleles from below. Aa BB BbTtttKkLl GG Oo ZZ

  2. Announcements GU plays tonight at 11 pm on ESPNU Homework tonight Quiz on Friday Progress Reports on Monday

  3. Agenda • Bean Genes Lab • Punnett Squares

  4. Bean Gene Lab • Please be careful not to make a mess!

  5. Punnett Squares • Please be careful not to make a mess!

  6. Punnett Square • Why? • Way of predicting the likelihood (probability) of offspring carrying certain genetic traits!

  7. What do we need to know? • 1. Genotype of parents • 2. Which allele is dominant

  8. Purebred = Homozygous • Purebred: • Both alleles are for the same trait • Example: • FF

  9. Hybrid = Heterozygous • Hybrid = The alleles are mixed; they are for different traits • Example: • Ff

  10. Quick Check: Homozygous = stand up, Heterozygous = sit down • BB • Homozygous • Bb • Heterozygous • bb • Homozygous • bB • Heterozygous

  11. Remember, capital letters are dominant!

  12. Let’s try another Punnett Square! • Hair Color in Humans • B = brown = dominant • b = blonde = recessive • Let’s say Kevin Federline and Britney Spears are having a baby…

  13. And Britney is homogenous for blonde hair, so…. Her genotype is bb KFed is heterozygous for brown hair, so…. His genotype is Bb b b B Bb Bb b bb bb

  14. b b B Bb Bb b bb bb 50% Brown Hair 2/4 50% Bb 2/4 bb 2/4 50% Blonde Hair 2/4 50% The likelihood that an offspring will have Brown Hair is ______________ . The probability that an offspring will have Blonde Hair is ____________ .

  15. ***Important*** • Probability is the likelihood something will happen, or the chance that something will happen. • If there is a 25% chance that your kids will have blue eyes, it does not mean that if you have 4 kids one of them is definitely going to have blue eyes!

  16. Widow’s Peak A recessive gene W = Normal Hairline w = Widow’s Peak

  17. Let’s say you have two parents who are heterozygous for the gene What are their genotypes? Ww and Ww • 1. What are the chances that their offspring will have a widow’s peak? • 2. What are the chances that their offspring will not have a widow’s peak but will carry an allele for a widow’s peak? • 3. What are the chances that their offspring will not have a widow’s peak and will not carry a gene for a widow’s peak?

  18. Let’s see what happens if the parents have the following genotypes: • Ww and ww • 1. What are the chances that their offspring will have a widow’s peak? • 2. What are the chances that their offspring will not have a widow’s peak but will carry an allele for a widow’s peak? • 3. What are the chances that their offspring will not have a widow’s peak and will not carry a gene for a widow’s peak?

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