Chapter 2 slides

Chapter 2 slides - Chapter 2 Heredity and Environment...

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Chapter 2 Heredity and Environment Fertilization _ The union of the father’s sperm cell with the mother’s egg Allele _ An alternative version of a gene; alleles operate in pairs across matched chromosomes Zygote _ Human organism after egg cell begins to divide Mitosis _ Copy division Meiosis _ Reduction division Monozygotic (MZ) Twins _ Identical twins _ These twins form when one zygote divides Dizygotic (DZ) Twins _ Fraternal twins _ These twins form when two eggs are fertilized by two different sperm cells Sex Chromosomes _ The 23 rd pair of chromosomes specialized to determine the sex of the child
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Dominant-Recessive Relationships _ To express a recessive trait, the individual needs to inherit two recessive alleles – one on each chromosome. Dominant Gene Diseases _ Individuals only need one dominant allele to inherit the trait. Recessive Gene Diseases _ Individuals must inherit two recessive alleles – one from each parent – to show the trait. X-linked (sex-linked) Traits
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This note was uploaded on 12/21/2010 for the course PSYCH 4 taught by Professor Ritabutterfield during the Fall '10 term at Santa Rosa.

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Chapter 2 slides - Chapter 2 Heredity and Environment...

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