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.

[ answer ]

foliated

[ explanation ]

foliation forms in a rock when pressure squeezes the rock together. the rock then has a design of many different color little lines. there are three types of foliated rock. the types are slate, schist, and gneiss. each type of foliated rock is different based on grain size and foliation characteristics. the lines appear when the rock has been under pressure.

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.