Given below are statements on concepts of genetics.
A. The degree to which a particular gene is expressed in a phenotype is called ____________.
B. A heritable change in gene expression that does not result from a change in the nucleotide sequence of the genome is called ________ change.
C. The frequency with which a dominant or homozygous recessive gene is phenotypically expressed within a population is called ____________.
D. An allele that results in the death of organisms that is homozygous for the allele is ___________.
Which one of the following options represents the most appropriate sequence of terms to fill all the blank spaces in the above statements?
1
A - expressivity, B - epigenetic, C - penetrance, D - recessive lethal
2
A - penetrance, B - mutation, C - expressivity, D - dominant lethal
3
A - penetrance, B - epigenetic, C - distribution, D - conditional lethal
4
A - epistasis, B - mutation, C - penetrance, D - dominant lethal