An Allele of RNA Polymerase in Drosophila Demonstrates a Recessive

Multiple Choice

An allele of RNA polymerase in Drosophila demonstrates a recessive lethal inheritance pattern.Which of the following is true?

A) Two homozygous recessive parents will have 100% homozygous offspring.
B) The threshold effect is not seen in recessive lethality.
C) Two heterozygotes will have offspring with a 2:1 pattern.
D) Homozygous lethal genes will always demonstrate a gain of function pattern.
E) Homozygous recessive offspring will never be seen.