Ch 11 The Basic Principles of Heredity pg 9

Ch 11 The Basic Principles of Heredity pg 9 - chromosome,...

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Chapter 11 The Basic Principles of Heredity a. Sum rule- predicts the combined probabilities of mutually exclusive events. If one occurs, the other does not. Bb + Bb = ¼ B egg combines with b sperm or ¼ B sperm combines with B egg ¼ + ¼ = ½ = probability of obtaining a Bb child b. Use common sense –“Chance has no memory” – if events are truly independent, past events have no influence on the probability of occurrence of future events Inheritance and Chromosomes X. Linked genes do not assort independently A. Linkage- tendency for a group of genes on the same chromosome to be inherited together in successive generations a. This happens because loci happen to lie close to one another in the same pair of homologous
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Unformatted text preview: chromosome, alleles do not assort independently= linked genes B. two-point test cross- heterozygous individuals are mated to homozygous recessive individuals = alleles of two loci are involved= to distinguish between independent assortment and linked genes C. Recombination- process leads to new gene combinations a. recombination types b. parental types- identical to gametes produced by P generation D. Crossing over- when chromosomes pair and undergo synapis, crossing over occurs as homologous (nonsister) chromatids exchange segments of chromosome material by a process of breakage and rejoining catalyzed by enzymes...
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This note was uploaded on 01/08/2010 for the course BIO 01-119-10 taught by Professor D'arville during the Fall '09 term at Rutgers.

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