An aide asks the nurse why people who have neurofibromatosis will ...

[Starlight]

An aide asks the nurse why people who have neurofibromatosis will show varying degrees of the disease. Which genetic principle should the nurse explain to the aide?
 
  a. Penetrance
  b. Expressivity
  c. Dominance
  d. Recessiveness

Question 2

A 20-year-old pregnant female gives birth to a stillborn child. Autopsy reveals that the fetus has 92 chromosomes. What term may be on the autopsy report to describe this condition?
 
  a. Biploidy
  b. Triploidy
  c. Tetraploidy
  d. Aneuploidy

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Answer to Question 1

ANS: B
Expressivity is the extent of variation in phenotype associated with a particular genotype. For neurofibromatosis, a variety of manifestations occur among individuals. The penetrance of a trait is the percentage of individuals with a specific genotype who also exhibit the expected pheno-type. Dominance refers to observable traits and risk of transmission. Recessiveness refers to silent strains with reduced risk of occurrence.

Answer to Question 2

ANS: C
Tetraploidy is a condition in which euploid cells have 92 chromosomes. Biploidy is a euploid cell with two times more chromosomes, or 46. Triploidy is a zygote that has three copies of each chromosome, rather than the usual two. Aneuploidy is when an aneuploid cell does not contain a multiple of 23 chromosomes.

[Starlight]

Thanks for the timely response, appreciate it

[31809pancho]

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