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Modern Genetics

Explore the Chromosome Theory of Inheritance, Sex-linked Traits, Pedigree Analysis, and Codominance in Genetic Traits. Discover how genes are passed down and why offspring exhibit certain traits. Dive into the world of linked traits and inheritance patterns.

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Modern Genetics

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  1. Modern Genetics Linked Traits and Human Genetics

  2. Chromosomes and Inheritance • Chromosome Theory of Inheritance – states that genes are located on chromosomes and these chromosomes are passed from parent to child

  3. Sex-linked traits • Many species have sex chromosomes that determine if you are male or female, humans do also • Any gene located on either sex chromosome (X or Y) is called a Sex-linked Trait

  4. Tracking Genetic Traits • Since geneticists can’t control people having children (that would be immoral….and creepy) they must analyze patterns • Pedigree – a family tree that records and traces traits (phenotypes)

  5. Tracking Genetic Traits Carrier

  6. Sample Problem • The offspring would look something like this • Why are all the offspring tall? • Dominant – an allele that “masked” or covers up another allele • Recessive – an allele that does not show up in a heterozygous individual, it is “masked”

  7. Codominance • Codominance – when a heterozygous individual expresses both traits equally, one allele is not completely dominant

  8. Codominance • Example 1: • Blood type has 3 alleles • IA - Dominant • IB – Dominant • i – Recessive

  9. Codominance • Example 1: IB IB IA IAIB IAIB IA IAIB IAIB

  10. Codominance • Example 2: i i IA IAi IAi i ii ii

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