The brains of individuals affected by Alzheimer disease are routinely found to contain

Please just explain correct! Thank you!

The brains of individuals affected by Alzheimer disease are routinely found to contain _________ and __________ that are the cause of the associated dementia.

  • cellular lesions; mutant huntingtin
  • CAG triplet repeats; copy number variant mutations
  • gyri; sulci
  • amyloid plaques; neurofibrillary tangles
  • trinucleotide repeats; cellular lesions

Mutation differs from other sources of genetic variation because it

  • always harms the phenotype.
  • only affects some populations.
  • introduces a change, rather than mixing up existing DNA sequences.
  • is unpredictable.
  • does not occur at the genetic level.

Fur color is an X linked trait in cats. Black (XB)is dominant over orange (Xb). If an orange female cat and a black male cat have kittens, what is the probability of obtaining an orange kitten?

  • 50%
  • 25%
  • 100%
  • 33%
  • 0%
 
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