APPH 1040 Lecture Notes - Lecture 2: Walter Bradford Cannon, Central Nervous System, Y Chromosome
3 Jun 2015
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Apph 1040: scientific foundation of health- lecture 2: health inheritance/stress. Inheritance: process by which physical and biological characteristics are transmitted from parents to their offspring. Chromosomes- bundles of dna, reside in nucleus of cells. A human karyotype contains 22 pairs of body chromosomes called autosomes. Pair 23 determines sex xx- female xy- male. An alternative form of a gene occurring at the same locus is called an allele. Father contributed either an x or a y chromosome to egg. Some traits found solely on x chromosome. Dominant: only one is necessary to pass on a trait. Recessive: an identical gene from each parent is needed to pass the trait on. Single gene disorders occur as a result of a defect in one gene. Defect occurs on autosome and the alley is responsible is recessive. Offspring must inherit recessive allele from both parents for trait to be expressed. Carrier parent not affected, but can pass on abnormal allele.
