Question

question 18
if the two alleles for a particular gene are identical the gene pair is:
a homologous
b heterozygous
c homozygous
d dominant
e recessive
question 19
if a human zygote is aneuploid, it has_.
a fewer than 46 chromosomes.
b more than 46 chromosomes.
c exactly 46 chromosomes.
d fewer or more than 46 chromosomes.
e fewer, more than, or exactly 46 chromosomes.

Explanation:

For Question 18, when two alleles for a gene are identical, the gene - pair is homozygous. Homologous refers to similar chromosomes, heterozygous means different alleles, and dominant and recessive describe allele expression.
For Question 19, aneuploidy in a human zygote means there is an abnormal number of chromosomes, which can be fewer or more than the normal 46.

Answer:

Question 18: C. Homozygous
Question 19: D. fewer or more than 46 chromosomes.