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Genetics opt

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    Genetics opt Genetics opt Presentation Transcript

    • 100’s of free ppt’s fromwww.pptpoint.com library Genetics The study of genes and the inheritance of traits
    • Characteristics These are features you exhibit physically ( your looks)Example: Eye color - green
    • Traits The different versions of a characteristic Example: blue, green, and brown eyes
    • Inheritance  Occurs when traits are passed down from parent to child.
    • Genes  Bits of information passed down from parent to child.  Made of chemicals called DNA.
    • Genetic Diseases  Can be passed on through genes from a parent to the child.  Example : Marfan Syndrome (Individual is tall, has long arms and legs) Remember - JOE
    • Reproduction  Sexual – Sperm fertilizes an egg to produce offspring  Asexual – occurs when 1 organism copies itself to produce offspring
    • Fertilization Occurs when a sperm unites with an egg
    • Offspring Another name for the children of a male and female parent
    • Mutation  Occurs when genes make a mistake mixing and produce new or different traits in the offspring.
    • Genotype  A combination of alleles Example: TT, Tt, or tt*We flipped coins to determine thegenotype of our critters andpuppies.
    • Alleles T – is considered a dominant allele TT – is dominant t – is considered a recessive allele Tt or tT – is dominant tt - is recessive
    • Punnett Square Uses mom and dad’s genotypes to determine the possible traits of their offspring. 4 offspring
    • Phenotype They are the traits determined by reading the genotype. Example : FF = black fur Black fur is the phenotype or trait