If you want your answer to be answered, you must put more detail into your question please.
Maybe you could just edit this.
Answer:
The correct answer would be non-disjunction.
Down syndrome refers to the genetic disease caused by the non-disjunction of chromosome number 21.
Non-disjunction refers to the event in which the homologous chromosomes or sister chromatids fail to separate properly during a cell division.
In Down syndrome, the sister chromatids of chromosome 21 fail to separate properly which results in the formation of a gamete with 2 copies of chromosome 21.
When this gamete fertilizes with another gamete, it results in the formation of a zygote with 47 chromosomes, that is, 46 chromosomes + extra copy of chromosome 21.
D. the number of mates on the island
their appearance changes cause different birds breeding together can make an impact of how the bird looks
Answer:
A. farming of coral organisms for trade
Explanation:
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