Chapter10&11(Sum07)

Chapter10&11(Sum07) - Estimated Grade Scale Test 1...

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Estimated Grade Scale – Test 1 (Mean % score= 64)
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PRACTICE: To the left is a picture of the chromosomes of a cell in G1 of the cell cycle. Draw what this cell will look like at: 1) G2 2) Metaphase 3) After cytokinesis
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Salamander Haploid = 3 Draw Anaphase in Mitosis Draw Anaphase in Meiosis I Draw Anaphase in Meiosis II
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Inheritance Chapter 10
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b A brown-eyed male husky and a brown- eyed female husky are the parents of this blue-eyed puppy. Where did the blue eyes come from?
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1 Removed stamens from purple flower White Stamens Carpel Purple PARENTS (P) OFF- SPRING (F 1 ) 2 Transferred pollen from stamens of white flower to carpel of purple flower 3 Pollinated carpel matured into pod 4 Planted seeds from pod Stamen Carpel Cross-fertilization Gregor Mendel
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Mendel studied 7 pea characteristics He made sure he had pure-breeding varieties, before cross fertilizing Example: Pure-breeding yellow seeded plant (self- fertilized) only yellow offspring FLOWER COLOR FLOWER POSITION SEED COLOR SEED SHAPE POD SHAPE POD COLOR STEM LENGTH Purple White Axial Terminal Yellow Green Round Wrinkled Inflated Constricted Green Yellow Tall Dwarf
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There were no greenish yellow peas, only yellows… was the “heritable factor” for green peas lost?
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Mendel’s hypotheses: There are alternative forms of genes, the units of heritable traits. (ex: tall or short) For each inherited characteristic, an organism has two genes, one from each parent. They may be the same or different. (ex: tall/tall or tall/short One form of the gene is dominant over the other form. (ex: tall/short looks tall)
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Alternative forms of a gene (alleles) reside at the same locus (location) on homologous chromosomes Homologous chromosomes bear the two alleles for each characteristic P a B DOMINANT allele RECESSIVE allele P a b GENOTYPE: PP aa Bb HOMOZYGOUS for the dominant allele HOMOZYGOUS for the recessive allele HETEROZYGOUS
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Genetic Terms A pair of homologous chromosomes A gene locus A pair of alleles Three pairs of genes One from mom One from dad Nearly identical chromosomes with different versions of genes
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Alleles Different molecular forms of a gene Arise by mutation Dominant allele masks a recessive allele that is paired with it
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Allele Combinations Homozygous having two identical alleles at a locus AA or aa Heterozygous having two different alleles at a locus Aa
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Mendel’s Theory of Segregation An individual inherits a unit of information (allele) about a trait from each parent During gamete formation, the alleles segregate from each other
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Monohybrid Crosses Use F 1 offspring of parents that breed true for different forms of a trait: ( AA x aa = Aa ) The experiment itself is a cross between two identical F 1 heterozygotes, which are the “monohybrids” ( Aa x Aa )
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This note was uploaded on 03/22/2009 for the course BIOL 101 taught by Professor Hogan during the Summer '08 term at UNC.

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Chapter10&11(Sum07) - Estimated Grade Scale Test 1...

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