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4-Genetics - Types of inheritance (by CJ)


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4-Genetics - Types of inheritance (by CJ)

  1. 1. Types of Inheritance CJ Baek B block IB Biology
  2. 2. What is inheritance?• Genetic trait or characteristic that is passed on from a parent to the next generation of offspring
  3. 3. Types of inheritance• Dominant-Recessive• Incomplete dominance• Co-dominant• Sex-limited• Sex-linked
  4. 4. Dominant-recessive• If both or one of the gametes are dominant, the dominant trait is inherited by the offspring• When one or both alleles is dominant the organism has the dominant trait• When it is a homozygous with recessive alleles, it has the recessive trait
  5. 5. Incomplete dominance• When neither allele has dominance over the other allele• The offspring would result as an intermediate of the two homozygous parental phenotype, and would therefore be a heterozygous• Ex. a pink flower would result when red and white flowers breed.
  6. 6. Co-dominant• When both alleles in a heterozygous organism contribute to phenotype• Both alleles are independently and equally expressed• Ex. When a red bull and a white cow breed a roan colored cow would result
  7. 7. Sex-limited• Cannot be identified with phenotype• Some characteristics unique to the sex will not be passed on, such as milking characteristic of females not being passed on to male
  8. 8. Sex-linked• Highly dependent on the X chromosome• X chromosome acts a recessive allele• XX makes female, XY makes male
  9. 9. Polygenetic inheritance• Single characteristic controlled by multiple genes
  10. 10. Polygenic inheritance in skin color• Gives rise to continuous variation in phenotype• Polygenic alleles can be contributing or non-contributing• The genotype varies due to segregation of alleles and unlinked chromosomes orienting randomly, and random fertilization of gametes• In total 9 genotypes are possible
  11. 11. Thank you• Citation: n4.html