Genetics - PowerPoint PPT Presentation

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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.

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Genetics

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Genetics l.jpg

Genetics

The study of genes and the inheritance of traits


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Characteristics

  • These are features you exhibit physically

    ( your looks)

    Example: Eye color - green


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Traits

  • The different versions of a characteristic

  • Example: blue, green, and brown eyes


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Inheritance

  • Occurs when traits are passed down from parent to child.


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Genes

  • Bits of information passed down from parent to child.

  • Made of chemicals called DNA.


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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


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Reproduction

  • Sexual – Sperm fertilizes an egg to produce offspring

  • Asexual – occurs when 1 organism copies itself to produce offspring


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Fertilization

  • Occurs when a sperm unites with an egg


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Offspring

  • Another name for the children of a male and female parent


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Mutation

  • Occurs when genes make a mistake mixing and produce new or different traits in the offspring.


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Genotype

  • A combination of alleles

    Example: TT, Tt, or tt

*We flipped coins to determine the genotype of our critters and puppies.


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Alleles

  • T – is considered a dominant allele

  • t – is considered a recessive allele

TT – is dominant

Tt or tT – is dominant

tt - is recessive


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Punnett Square

  • Uses mom and dad’s genotypes to determine the possible traits of their offspring.

  • 4 offspring


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Phenotype

  • They are the traits determined by reading the genotype.

  • Example : FF = black fur

  • Black fur is the phenotype or trait


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