Biology Set 9- Executive Academics- We Do Your Homework! – Flashcards
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Is it possible for a man with a dominant trait like Huntington disease to have a normal daughter by a woman who is homozygous recessive for Huntington
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Yes, because ONLY if the daughter inherits the man's dominant allele, she will have Huntington disease
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What is the genotype of a person with cystic fibrosis?
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Two mutant CFTR genes, one each on the homologous chromosomes for chromosome 7.
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Which of the following statements is incorrect about women with the BRCA gene?
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They will inevitably develop breast cancer.
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At what point in the metabolism of a cell does a mutation exert its potentially dysfunctional effects?
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after a protein is produced
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A mutation can cause:
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All of the above are true.
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A woman whose genotype is heterozygous for the cystic fibrosis gene
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has a 50% chance of passing the CF gene to her offspring
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Which of the following behaviors is not normally associated with a decreased risk of cancer?
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reducing the amount of fat in your diet
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Which of the following populations is known for a high incidence of sickle-cell anemia?
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people of African descent
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The particular mutation in the CFTR gene described in the book differs from a normal CFTR gene by:
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lacking three nucleotides, resulting in a CFTR protein with a missing amino acid.
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DNA mutations can arise from uncorrected errors in DNA replication, inheritance, and:
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environmental insults.
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We would all have many more mutations in our genes were it not for:
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the activity of proofreading enzymes.
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A child with cystic fibrosis
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has two homologous copies of chromosome 7.
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Which of the following pairs is an appropriate set of analogies for how oncogenes and tumor suppressor genes work, respectively?
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accelerators/brakes
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Which is the correct order of events in which breast cancer might develop?
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Inheritance of a mutant BRCA gene > replication errors create an oncogene > mutation of p53 > additional mutations permit spreading
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During the first division of meiosis:
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homologous pairs separate from each other.
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Which of the following statements is false about Ashkenazi Jews of Eastern European descent?
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Members of the Ashkenazi tend to marry someone from outside their community.
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What are the chances that a couple, who are both heterozygous for the cystic fibrosis gene, will give birth to a homozygous dominant child?
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25%
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Beside recombination, what other event in meiosis increases the genetic diversity of the gametes?
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the random line up and separation of maternal and paternal chromosomes
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Which of the following statements about meiosis is FALSE?
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It produces a diploid zygote
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Meiosis differs from mitosis in:
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the number of chromosomes in each ending cell
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