Introduction to Genetics

Introduction to - P pp p F 1 Generation Gametes Genetic makeup Appearance Purple flowers Pp P p 1 2 1 2 F 2 Generation Sperm Eggs P P PP Pp p p Pp

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Introduction to Genetics Biology Ted Becker WMCC Summer 2011
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Review Who was Mendel? What did Mendel do? Define: Homozygous, Heterozygous, Dominant, Recessive Genotype, Phenotype
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Mendel’s Principles Inheritance of traits happens on things called genes. Genes are passed from parent to child. Some genes are dominant over others Each organisms has two copies of the gene, one from each parent. Alleles for each gene segregate independently.
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Fig. 14-2 TECHNIQUE RESULTS Parental generation (P) Stamens Carpel 1 2 3 4 First filial gener- ation offspring (F 1 ) 5
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Fig. 14-5-1 P Generation Appearance: Genetic makeup: Gametes: Purple flowers White flowers PP P pp p
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Fig. 14-5-2 P Generation Appearance: Genetic makeup: Gametes: Purple flowers White flowers PP P pp p F 1 Generation Gametes: Genetic makeup: Appearance: Purple flowers Pp P p 1 / 2 1 / 2
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Fig. 14-5-3 P Generation Appearance: Genetic makeup: Gametes: Purple flowers White flowers PP
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Unformatted text preview: P pp p F 1 Generation Gametes: Genetic makeup: Appearance: Purple flowers Pp P p 1 / 2 1 / 2 F 2 Generation Sperm Eggs P P PP Pp p p Pp pp 3 1 Beyond Dominance and recessiveness • Incomplete dominance –mirabilis plants – Results in combination of colors • Co-dominance – speckled hens – All genes show up • Polygenic traits – more than one gene controls – Human skin color Incomplete dominance Codominance Meiosis (to REVIEW) • NOT Mitosis 2x • How we make gametes (sex cells) • Start with diploid number of chromosomes (2N) • Ends with haploid number (N) • Starts with 1 cell ends with 4 cells – 4 normal sperm – 1 normal egg and 3 polar bodies • How is meiosis different than mitosis? Genetic Variability • Crossing over = Homologous chromosomes exchange alleles...
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This note was uploaded on 09/13/2011 for the course ECON 101 taught by Professor Myers during the Spring '08 term at William & Mary.

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Introduction to - P pp p F 1 Generation Gametes Genetic makeup Appearance Purple flowers Pp P p 1 2 1 2 F 2 Generation Sperm Eggs P P PP Pp p p Pp

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