A is the answer
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You can tell it's not a dominant trait because it would show in all the grandchildren.
Recessive
#12 is heterozygous
Answer:
Chromosome structure consists of a long arm region and a short arm region connected at a central region known as a centromere. The ends of a chromosome are called telomeres. Duplicated or replicated chromosomes have the familiar X-shape and are composed of identical sister chromatids.
Explanation: