Chromosomal abnormalities occur when a zygote's cells have: ...

[Deast7027]

Chromosomal abnormalities occur when a zygote's cells have:
 
  the usual 46 chromosomes.
  gametes with 46 chromosomes.
  more or fewer than the usual 46 chromosomes.
  the usual 46 chromosomes with damage to the gametes.

Question 2

Henry was adopted and is genetically predisposed toward alcoholism. However, his adoptive family does not drink; they actively avoid alcohol for religious reasons. Given Henry's genetic potential
 
  he will most certainly become an alcoholic later in life.
  he may drink without worry as an adult because of his early upbringing.
  alcoholism might not appear in Henry's phenotype.
  alcoholism may alter his genotype.

[tashiedavis420]

Answer to Question 1

more or fewer than the usual 46 chromosomes.

Answer to Question 2

alcoholism might not appear in Henry's phenotype.

[Deast7027]

Gracias!

[yeungji]

Great answer, keep it coming