Bio 211

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Bio 211
2011-11-07 16:55:39
Chapter 17 Complex patterns inheritance

Chapter 17
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  1. Simple Mendelian patterns may deviate when:
    • 1. A single gene produces multiple phenotypes
    • 2. When alleles are not completely dominant or recessive
    • 3. When a particular gene has more than 2 alleles
  2. Most genes have multiple phenotypic effects. This is called?
  3. What is it called when phenotypes of the heterozygote and the dominant homozygote are identical?
    Complete dominance
  4. What it is called when the phenotype of the F1 hybrids is somewhere between the phenotype of the 2 parental varieties?
    Incomplete dominance
  5. True or False: Dominant alleles are always more common in population than recessive alleles.
  6. What is codominance?
    Two alleles both affect the phenotype in separate, distinguishable ways
  7. Phenotype depends on _______ and ________.
    environment and genotype
  8. What is epistasis?
    The alleles of one gene mask the expression of the alleles of another gene. It was discovered by Bateson and Punnett in the early 1900's when studying sweet peas
  9. Traits that are "either or"traits are referred to as what?
  10. Traits that vary in a population along a continuum creating a bell shaped curve are called what?
  11. Who was the first scientist to associate a specific gene with a specific chromosome?
    Thomas Hunt Morgan
  12. A normal character phenotype is referred to as what?
    Wild type
  13. What 3 ideas did Morgan propose?
    • 1. Genes are said to be linked and are inherited together as a unit called a linkage group
    • 2. Due to crossing over during meiosis, homologous chromosomes can exchange pieces of chromosomes and create new combinations of alleles
    • 3. The likely hood of a crossover occurring in the region between two genes depends on the distance between two genes
  14. Map distance =
    • number of recombinants
    • ------------------------------------ x 100
    • total number of offspring
  15. True or False: The farther apart two genes are, the higher the probability that a cross will occur.
  16. What is it called when some inheritance patterns do not conform to the law of segregation and when some genes are not found on the same chromosomes in the cell nucleus and do not segregate the same way
    Extranuclear Inheritance
  17. What is the maternal effect?
    The genotype of the mother determines the phenotype of the offspring