polyploidy plants are sterile, usually completely seedless, but may have vestiges of seeds (like the kind of bananas we eat do). Polyploidy plants also usually produce much larger plants than their aneuploidy counterparts do. Bigger fruits are more marketable than smaller ones.
Source from: https://answers.yahoo.com/question/index?qid=20100117182433AAx7K1t
Explanation:
The role of a primer is to provide to the DNA polymerase a 5´ end, from where start to synthesize the new straid. DNA polymerase can not work on 3´ end direction, so if you forget to add the primers on your PCR mix reaction, when you procede to reveal the result, you will see nothing. The rection would never take places, becouse polymerase could not act.
i believe the answer is commensalistic symbiosis
The presence of stapylococcus aureus in skin as normal flora doesn't give the human host any benefit, while stapylococcus aureus could find food on the human skin. Since only one side has got the profit, the symbiosis would be called commensalistic symbiosis. It was different for the normal flora inside the intestine because the host got some benefit, thus it was mutualistic symbiosis.