Lecture05_bio201_f07[1]

Lecture05_bio201_f07[1] - ARIZONA STATE UNIVERSITY Lecture...

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Human Human Anatomy Anatomy SEVENTH EDITION SEVENTH EDITION Elaine N. Marieb Elaine N. Marieb Katja Hoehn Katja Hoehn ARIZONA STATE UNIVERSITY Lecture Series 6 Lecture Series 6
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Bio 201 ASU DPC J. Genetics The study of the mechanism of heredity Nuclei of all human cells (except gametes) contain 46 chromosomes Sex chromosomes determine the genetic sex (XX = female, XY = male) Karyotype – the diploid chromosomal complement displayed in homologous pairs Genome – genetic (DNA) makeup represents two sets of genetic instructions – one maternal and the other paternal
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Bio 201 ASU DPC J. Alleles Matched genes at the same locus on homologous chromosomes Homozygous – two alleles controlling a single trait are the same Heterozygous – the two alleles for a trait are different Dominant – an allele masks or suppresses the expression of its partner Recessive – the allele that is masked or suppressed
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Bio 201 ASU DPC J. Genotype and Phenotype Genotype – the genetic makeup Phenotype – the way one’s genotype is expressed
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Bio 201 ASU DPC J. Segregation and Independent Assortment Chromosomes are randomly distributed to daughter cells Members of the allele pair for each trait are segregated during meiosis Alleles on different pairs of homologous chromosomes are distributed independently
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Bio 201 ASU DPC J. Segregation and Independent Assortment The number of different types of gametes can be calculated by this formula: 2 n , where n is the number of homologous pairs In a man’s testes, the number of gamete types that can be produced based on independent assortment is 2 23 , which equals 8.5 million possibilities
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ASU DPC J. Independent Assortment
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This note was uploaded on 04/29/2008 for the course BIO 201 taught by Professor Oberstein during the Fall '08 term at ASU.

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Lecture05_bio201_f07[1] - ARIZONA STATE UNIVERSITY Lecture...

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