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Chapter 14

BIO152H5 Chapter Notes - Chapter 14: Heredity, Mendelian Inheritance, Sex Organ


Department
Biology
Course Code
BIO152H5
Professor
Maria Arts
Chapter
14

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Chapter 14
Drawing from the Deck of genes
Eplaatio of heredit ost idel i faour durig the 8s as the ledig
hypothesis, the idea that genetic material contributed by the two parents mixes in a
manner analogous to the way blue and yellow mix to give you green.
Hypothesis predicts that, over many generation, a freely mating population will give rise
to a uniform populations of individuals devoid of variation (no variation among the pop)
Our everyday observations contradict this hypothesis
Blending hypothesis fails to explain inheritance, such as traits reappearing after skipping
a generation
Alteratie to the ledig odel is a partiulate hpothesis of iheritae: the gee
idea.
Particulate hypothesis suggests that parents pass on discrete heritable units-genes-that
retain their seperate identities in offspring.
Deck of cards rather than a pail of paint
Deck of cards is shuffled, just like genes, and passed on.
14.1 Mendel used the scientific approach to identify two laws of inheritance
Why did mendel use peas?
o Available in many varieties
o Short generation time
o Large number of offsprings from each mating
o Sex organs are in the plants, therefore mating can be controlled
Definitions
Character: heritable feature that varies among individuals
Trait: each variant of character
True-breeding: Over many generation of self- pollination, same variety of plants
produced.
Hybridization: mating of two true-breeding plants
P generation: parental generation, this is the true-breeding plants that are mating
F1 generation: the off springs of the hybrids
F2 generation: when the hybrid off springs either self-pollinate or mate with each other,
they produce this generation.
2 fundamental principles of heredity: law of segregation and the law of independent
assortment
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