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Mr. Martell 506 Welcome 7th Graders You need: Composition Book 4 Handouts Qwizdom Remote (off) 2 1 Oct. 10th 2011 3 Mom? MONDAY: Who are my parents and why? Answer on green do-now log. Dad? 1 2 Offspring 3 Today’s Schedule Mr. Martell 506 Oct. 10th 2011 1. Do-Now 2. Recap of last week 3. Reading on inheritance 4. Define Genotype, Phenotype, Dominant, and Recessive 5. Exit Ticket Quiz DNA poster due Wed/Thur Homework is due Friday DarkEssential Matter Questions What creates diversity among offspring? Reading Mr. Martell 506 Oct. 10th 2011 1. Individually read the paper and answer the questions on the front and back. 2. Compare your answers with you’re the person sitting at your table 3. Generate definitions for the 4 words below and write them in your composition book on page 2-6. 1. Genotype 2. Phenotype 3. Dominant trait/allele 4. Recessive trait/allele Mr. Martell 506 Reading Oct. 10th 2011 Dominant Allele: No running (R) Recessive Allele: Running (r) R r r r R r R r R R or Mr. Martell 506 Vocabulary Dominant Trait A trait that is able to mask or cover the affects a recessive gene R r Oct. 10th 2011 Mr. Martell 506 Vocabulary Recessive Trait A trait that is only expressed when two copies are present. R r Oct. 10th 2011 Mr. Martell 506 Vocabulary Phenotype An organism’s observable characteristics or traits Oct. 10th 2011 Mr. Martell 506 Vocabulary Oct. 10th 2011 Genotype Bb Recessive allele Dominant allele Exit Ticket Question 1: The allele for freckles is (F), while the allele is for no freckles is (f). Using this information, you can infer that… A) No freckles is a dominant trait B) Freckles is a dominant trait C) People with the ff genotype will show freckles D) People with the Ff will show freckles Mr. Martell 506 Oct. 10th 2011 Exit Ticket Question 2: The allele for freckles is (F), while the allele is for no freckles is (f). What is the phenotype for person with the genotype, Ff. A) B) C) D) No freckles FF Freckles Ff Mr. Martell 506 Oct. 10th 2011 Welcome 7th Mr. Martell 506 Graders Oct. 11 & 12th 2011 Given the phenotype of the fruit fly, predict the fly’s possible genotypes: Phenotype: Curly wings, white eyes, tan body. Genotype: ? Wings Dominant A = curly Eye Color R = red Body Color B = tan Recessive a=straight r = white b = yellow Today’s Schedule Mr. Martell 506 Oct. 10th 2011 1. Do-Now 2. Define homozygous, heterozygous, and allele 3. Investigation 4. Exit ticket Homework and Poster is due Friday Essential Questions What creates diversity Dark Matter offspring? among How are the structures in genetics related? Mr. Martell 506 Homozygous vs. Heterozygous Phenotype: Curly wings, white eyes, tan body. Dominant Recessive Wings A = curly a=straight Eye Color R = red r = white Body Color B = tan Oct. 11 & 12th 2011 b = yellow Possible Genotype: AA, rr, BB AA, rr, Bb Aa, rr, BB Aa, rr, Bb How is this genotype different than the others? Homozygous vs. Heterozygous Mr. Martell 506 Oct. 11 & 12th 2011 Allele: a version of one gene Example: curly wing allele = A Example: straight wing allele = a “Homo” = Same Homozygous: having identical alleles or versions of a gene for a trait Example: Homozygous Dominant (AA) Example: Homozygous Recessive (aa) “Hetero” = Different Heterozygous: having different alleles or versions of a gene for a trait Example: Heterozygous (Aa) Homozygous vs. Heterozygous Mr. Martell 506 Review the handout from yesterday and classify each genotypes as…. 1) Homozygous dominant 2) Homozygous recessive 3) Heterozygous Oct. 11 & 12th 2011 Mr. Martell 506 Investigation Oct. 11 & 12th 1. Glue the investigation handouts into your composition book. 2. Read introduction and answer pre-lab questions Pg 2-7 Pg 2-8 2011 Investigation: Sexual Reproduction 1. Each partner will get a nucleus (plastic cup) with two chromosomes (popsicle sticks). 2. Close your eyes and randomly pick one chromosome to pass down to your offspring. Mr. Martell 506 Oct. 11 & 12th 2011 Chromosomes Male Nucleus Female Nucleus 3. Record the genotype and phenotype on your handout. 4. Add the traits to your fruit fly cut out and place on wall next to similar flies. 5. Repeat until you have data for 4 offspring Offspring Nucleus Investigation: Asexual Reproduction Mr. Martell 506 Oct. 11 & 12th 2011 1. Close your eyes and select both chromosomes from the female’s nucleus and place them in the offspring nucleus. 3. Record the genotype and phenotype on your handout. Female Nucleus 4. Add the traits to your fruit fly cut out and place on wall next to similar flies. 5. Repeat until you have data for 2 offspring Offspring Nucleus Investigation: Conclusion Answer the questions below using complete sentences. Mr. Martell 506 Oct. 11 & 12th 2011 Conclusion Questions 1) Compare the offspring made by sexual reproduction and asexual reproduction. 2) Explain why the offspring made by sexual reproduction differ from asexual reproduction. 3) Imagine a virus infects both populations of offspring and kills only red eyed flies. Which population of offspring is most likely to survive: the population of sexually or asexually reproducing flies? Explain your answer. Pg 2-9 BrainPop: Asexual Reproduction Mr. Martell 506 Oct. 11 & 12th 2011