In a duplication, a person has more than two alleles for a certain trait. crossing-over between sister chromatids has occurred twice a particular segment is missing on one chromosome. a chromosomal segment is turned 180 degrees. chromosomal segments are exchanged between two nonhomologous chromosomes. 4 points save answer

The right answer is a person has more than two alleles for a certain trait.

Duplication is a genetic mutation characterized by the doubling of genetic material on a chromosome. There are several mechanisms that result in the duplication of either a large chromosomal portion, a gene, or a nucleotide sequence.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

yes, because even though a theory has a  lot of evidence to support it, it is not always true