Which ensures only 1 allele from each parent is inherited

Chiasma

Explanation:

Chiasma occurs during the 1st stage of Meiosis, a cell division that halves the number of parent cell.

During the 1st stage of meiosis, Chiasma is the contact point between the two chromatids of a chromosome during meiosis. Thus, proper disjunction of a chromosome, which leads to segregation of alleles, requires the link Chiasma.

Note that any error in the Chiasma would lead to chromosomal deficiency like Down syndrome.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

answer; incomplete dominance;