4. Which best explains how meiosis is a contributing factor to genetic variation within a species? A) Meiosis reduces the number of mutations within an organism
B) Meiosis produces daughter cells that will contain identical chromosomes
C) Meiosis results in offspring that contain alleles from only one parent gamete
D) Meiosis allows for crossing over of chromosomes, resulting in new gene combinations

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions, because prokaryotes don't have nuclei.