SexLinkage1 - Sex Linkage and the Chromosome Theory of...

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Sex Linkage and the Chromosome Theory of Inheritance
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Gene Behavior and Chromosome Behavior Parallels Between
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Gene Behavior Chromosome Behavior Each cell contains two copies of each gene Each cell contains two copies of each chromosome
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Gene Behavior Chromosome Behavior Mendel’s genes are unchanged during transmission between generations The chromosome complement appears unchanged in different generations
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Gene Behavior Chromosome Behavior Alternative alleles of a gene segregate to different gametes (Mendel’s 1st Law) Homologous chromosomes separate during anaphase of meiosis I
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Gene Behavior Chromosome Behavior Gametes contain one copy of each gene Gametes contain one copy of each type of chromosome
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Gene Behavior Chromosome Behavior Different genes assort independently (Mendel’s 2nd Law) During meiosis I, different chromosome pairs align independently at the metaphase plate
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Gene Behavior Chromosome Behavior The union of gametes at fertilization produces an individual with two copies of every gene The union of gametes at fertilization produces an individual with two copies of every chromosome
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Gene Behavior Chromosome Behavior During the union of gametes at fertilization, alleles from one parent unite at random with alleles from the other parent During fertilization, an egg’s set of chromosomes unites with the chromosomes of a randomly-encountered sperm
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Gene Behavior Chromosome Behavior Each cell in a multicellular organism has the same set of genes Through mitosis, each cell in a multicellular organism acquires the same set of chromosomes
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Gene Behavior Chromosome Behavior In all cells, 1/2 of the genes are of maternal origin, the other 1/2 of paternal origin In all cells, 1/2 of the chromosomes are of maternal origin, the other 1/2 of paternal origin
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A A a a A A a a 1st division A A a a 2nd division gametes Meiosis and Mendel’s 1st Law Mendel’s 1st law results from the fact that each gamete obtains at random only one of the two alleles of a gene
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SexLinkage1 - Sex Linkage and the Chromosome Theory of...

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