genetics_guided_notes

genetics_guided_notes - Biology CP Name: _ Genetics Guided...

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Biology CP Name: _______________________ Genetics Guided Notes Per: _____ Date: _______________ Genetics: Study of heredity How certain traits are passed from parents to offspring Chromosomes: Transmit the traits Contain units of hereditary information Genes: Chromosome part (unit) that determines a trait of a living thing 1000’s of different genes – thus many different traits Each chromosome is made up of different genes Are arranged one next to another Genes are paired (remember – chromosomes in body cells are paired – one from your mother, one from your father) Each trait has a pair of genes that code for it Example: Chromosome pair Genes How genes are passed to offspring: 1. each parent has two genes for each trait 2. use letter to represent genes (use two letters – one from each parent – represents a pair of genes)
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3. gametes – have only one gene for each trait (aren’t paired) 4. Example: d = dwarf , D = Normal Dwarf Father Normal Mother Body cells dd DD Gametes d d D D Dominant Genes: Genes that prevent other genes from showing Use a capital letter(s) Recessive Genes: Genes which do not show if there is a dominant gene, even though they are present Only way the recessive trait shows is if there are two of the same recessive genes. Use a lowercase letter(s) Dwarf is recessive to Normal body shape Dwarf Body Shape: dd Normal Body Shape: DD Homozygous Dominant: Two dominant genes for the same trait Both genes are the same Example: DD OR Pure or Purebred:
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gene pairs are identical
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Homozygous Recessive: Two recessive genes for a trait will show the recessive trait Example: dd OR Pure Recessive Heterozygous or Hybrid Two different genes are present for a trait (a dominant and
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genetics_guided_notes - Biology CP Name: _ Genetics Guided...

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