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Genetics Crosses Ch. 9.2 (p.172-178)

Genetics Crosses Ch. 9.2 (p.172-178). Genotype = the genetic makeup of an organism (the genes you have) The alleles inherited from the parents for each trait This includes both dominant and recessive alleles T = allele for smooth texture seed ; t = allele for wrinkled texture.

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Genetics Crosses Ch. 9.2 (p.172-178)

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  1. Genetics CrossesCh. 9.2 (p.172-178) Genotype= the genetic makeup of an organism (the genes you have) • The alleles inherited from the parents for each trait • This includes both dominant and recessive alleles • T = allele for smooth texture seed ; t = allele for wrinkled texture Suggest abbreviations for the following traits: Widow’s Peak Hairline (dominant) = _____ Strait Hairline (recessive) = _____

  2. Genetics CrossesCh. 9.2 (p.172-178) Genotype= the genetic makeup of an organism (the genes you have) • The alleles inherited from the parents for each trait • This includes both dominant and recessive alleles • T = allele for smooth texture seed ; t = allele for wrinkled texture Suggest abbreviations for the following traits: Widow’s Peak Hairline (dominant) = _W_ Strait Hairline (recessive) = __w_

  3. Genetics CrossesCh. 9.2 (p.172-178) Phenotype= the physical expression of the genes, or what the organism looks like • Dominant allele always expressed (written as CAPITAL LETTER) • Recessive allele only expressed if no dominant to block it (lowercase letter)

  4. Genetics CrossesCh. 9.2 (p.172-178) Homozygous = Both alleles for a characteristic are the same (TT or tt) Heterozygous = 2 alleles for a characteristic are different (Tt or tT) Probability = chance of something happening Can a recessive Phenotype by homozygous, heterozygous, or both?

  5. Genetics CrossesCh. 9.2 (p.172-178) Punnett Square = diagram used to predict the probability of genotype inheritance • Example with seed texture • crossing pure smooth seed plant (TT) with pure wrinkled plant (tt)

  6. Genetics CrossesCh. 9.2 (p.172-178)

  7. Genetics CrossesCh. 9.2 (p.172-178)

  8. Genetics CrossesCh. 9.2 (p.172-178)

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