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Patterns of Inheritance Notes

Patterns of Inheritance Notes. QOTD: Can we predict what the offspring of two individuals will look like? Explain why or why not. For every trait you receive one allele from each parent. Phenotype =. Phenotype=. Floppy-ears. Straight-ears. Genotype=. SS or Ss. Genotype=. ss.

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Patterns of Inheritance Notes

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  1. Patterns of Inheritance Notes QOTD: Can we predict what the offspring of two individuals will look like? Explain why or why not.

  2. For every trait you receive one allele from each parent Phenotype = Phenotype= Floppy-ears Straight-ears Genotype= SS or Ss Genotype= ss

  3. Genotype and Phenotype • Genotype – The genetic code of an organism • Phenotype – The physical characteristics that are created by that code.

  4. Crossing homozygous straight with homozygous floppy SS x ss What will be the offspring’s genotype? Ss What will be the offspring’s phenotype? Straight-ears

  5. Cross a homozygous floppy with heterozygous straight Ss x ss Offspring of two types possible: Ss or ss Heterozygous straight Homozygous floppy

  6. But what if we cross two heterozygous rabbits?Ss x Ss • Now we need to think about sexual reproduction again. How much DNA do you get from each parent? • Meiosis divides the number of chromosomes in half to make gametes. This process separates the two alleles of the parents. • Since genes are on chromosomes, we now have sperm with either S or s, and eggs with either S or s. We can put them in a Punnet square to see the possible outcomes.

  7. male female Parents: Ss Ss x meiosis S s S s Gametes: sperm eggs Recombining alleles Genotypes Phenotypes 1 SS 2 Ss 1 ss sS ss Straight Straight SS Ss Floppy

  8. Bikini Bottom Genetics!

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