ANTH200: Ch.2

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moore.1779
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54660
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ANTH200: Ch.2
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2010-12-09 17:55:14
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Human Genetics
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Ch.2 quiz review
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  1. The total DNA sequence of an organism is known as its
    genome.
  2. The shape of a DNA molecule is a
    helix.
  3. Assume a locus with two alleles, F and G. If a woman with genotype FG mates with a man with genotype FG, the expected proportion of heterozygotes among their offspring is
    50 percent.
  4. Some genes can have multiple effects on an organism, such as affecting different physical and biochemical systems. This is known as
    pleiotropy.
  5. The MN blood group has two codominant alleles. How can a woman with type M blood have a child with type N blood?
    The woman could never have a child with type N blood.
  6. Alleles are _________ if both of their effects are shown in the phenotype
    codominant
  7. There are two alleles for the PTC-tasting locus in humans: T, which codes for tasting, and t, which codes for non-tasting. T is dominant and t is recessive. Imagine two parents that are tasters have a child that is a non-taster. Given this information, you know that the genotypes of the parents had to have been
    Tt and Tt.
  8. Genes that are involved in turning protein-coding genes on or off, which affects how these genes are expressed, are known as __________ genes.Answer
    regulatory
  9. Humans have 23 pairs of chromosomes. The process of sex-cell formation provides _____________ chromosomes to an offspring from each parent.
    23
  10. Human beings have ____ pairs of chromosomes.
    23
  11. The polymerase chain reaction (PCR) is used for
    amplifying small amounts of DNA for analysis.
  12. DNA consists of coding sections (known as ________) and non-coding sections (known as _________).
    exons / introns
  13. Human behavior is clearly the result of
    genetics and environment
  14. Each amino acid is coded for by _______ chemical bases.
    3
  15. ____________ is the production of body cells, whereas _________ is the production of sex cells
    Mitosis / meiosis
  16. Many traits are affected by both genetic and environmental factors. If everyone in a population had the exact same environment, the heritability would be ____ percent.
    100
  17. For the human sex chromosomes, males have
    an X chromosome and a Y chromosome.
  18. Mitochondrial DNA is inherited from
    the mother.
  19. Hemophilia is caused by a recessive allele found on the X chromosome. As such, hemophilia will be
    more common in males than females.
  20. _________ genes encode a sequence of 60 amino acids that regulate embryonic development.
    Homeobox
  21. Where is DNA found in a cell?
    Mostly in the nucleus, with a small amount in the mitochondria.
  22. Y chromosome DNA is inherited from
    the father.
  23. Sometimes alleles for different genes are inherited together, which is due to
    linkage
  24. _____________ is responsible for transporting genetic information to the site of protein synthesis.
    Messenger RNA
  25. Imagine a species where there is a locus with two alleles, A and B. Further imagine that A and B are codominant. How many different phenotypes are possible in this species?
    3
  26. Conditions such as Down syndrome involve
    monosomy and trisomy

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