<span>Those based on observation, measurement, and reason.</span>
Answer:
The behavior of chromosomes during meiosis and fertilization is responsible for most of the variation that arises each generation during sexual reproduction. Independent assortment of chromosomes contributes to genetic variability due to the random orientation of tetrads at the metaphase plate. or Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I .
Answer:
Reverse translate from amino acids (protein) to RNA then reverse transcribe to DNA. However, its not exact because there are no introns because they got cut out because they didn't code for the protein so you can't get the original strand and also because some amino acids have multiple codons.
