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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