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Alona [7]
3 years ago
7

A person with Down Syndrome has an additional #21 chromosome in every somatic cell. This condition is also called trisomy 21. Th

e cause of this syndrome A) is not known B) is due to crossing over of genes during Prophase 1 of meiosis C) is through the union of a normal gamete with the haploid amount of chromosomes (n) and another gamete with an extra #21 (n + 1) D) is through a mutation during DNA replication of mitosis in a somatic cell, and this mutation spreads to all other somatic cells in the body
Biology
1 answer:
olasank [31]3 years ago
4 0

Answer:

d

Explanation:

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