Crossing over and the separation of duplicated homologous chromosomes in the first division produce genetic variation. true false

True

Explanation:

Crossing over is the swapping of genetic material during meiosis, which is the process by which egg and sperm (gametes) are created. During prophase of this type of cell division, paired chromosomes from each parent align so they are able to exchange segments between nonsister chromatids in meiosis. This process creates new combinations of genes in the gametes that is going to be created and those genes are not found in either parent, contributing to genetic diversity.

Also, during anaphase of meiosis, the pairs of homologous chromosome are separated to form gametes (which are haploid cells), and this separation is random. This means, of the two chromosomes that already have genetic diversity due to crossing over, each one is going to end up in a new cell randomly. And any of this new gametes with all of these genetic diveristy, will be used during fertilization to create a new organism.

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pesticide

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands