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Nonmendelian Genetics

Nonmendelian Genetics. Test Monday 1/31. Vocab Check…. Chromosome: DNA that has been tightly wound together, individuals genetic code Gene: segment on a chromosome that code for a trait Allele : distinct form of a gene. Multiple Alleles.

paul-pickett
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Nonmendelian Genetics

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  1. Nonmendelian Genetics Test Monday 1/31

  2. Vocab Check… • Chromosome: DNA that has been tightly wound together, individuals genetic code • Gene: segment on a chromosome that code for a trait • Allele: distinct form of a gene

  3. Multiple Alleles • When three or more alleles are formed in a population. These genes have multiple alleles • EX: Blood Type– A, AB, B, O

  4. Blood Types • O is recessive • A and B are both dominant (codominant)

  5. Blood Types How common are the blood types? Transfusions: Safe Transfusions Antigen on Red Blood Cell Phenotype (Blood Type Genotype From To

  6. Blood Types • Cross a female who is heterozygous with A blood and a male who is heterozygous with B blood

  7. Codominance • When both alleles are expressed (seen) fully • Happens in the heterozygous (Bb, Hh) • EX: speckled chickens and Blood Type

  8. Codominancein Chickens • In chickens: BB=black Bb=speckled (codominant) bb=white Work a punnett square crossing a black rooster with a white hen

  9. Codominance in Chickens • What are the genotypes from the cross? • What are the phenotypes from the cross? • Phenotype is not read as a dominant look! In codominant traits both alleles are expressed hence the speckled look

  10. Codominance in Chickens X

  11. Codominance in Palomino Horses X

  12. Incomplete Dominance • When two different alleles for the same trait COMBINE, but neither “wins” expression over the other • Shows a BLENDED look phenotype in the heterozygous (Bb, Hh)

  13. Incomplete Dominance—Snapdragons • Snapdragons inherit color by incomplete dominance RR=red rr=white Rr= PINK (blended look) Cross 2 heterozygous snapdragons

  14. Incomplete dominance--Snapdragons • What are the genotypes from the cross? • What are the phenotypes from the cross? • Phenotype is not read as a dominant look! In incomplete dominant traits the allele is expressed as BLENDED

  15. Incomplete Dominance--Snapdragons X

  16. Incomplete Dominance—Rabbits • Alleles are BLENDED—black rabbit crossed with a white rabbit makes a gray rabbit X

  17. Sex-Linked Traits • Traits which are carried on the X chromosome • More common in MALES • EX: colorblindness, hemophelias

  18. Sex-Linked Traits--Colorblindness • Colorblindness is a recessive trait

  19. Sex-Linked Traits--Colorblindness • Cross a female carrier with a normal male • What are the genotypes and phenotypes?

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