List and briefly explain the three ways in which genetic variability is increased during meiosis
What will be an ideal response?
Meiosis increases genetic variability in three ways: recombination, random segregation, and random
fertilization. Recombination is where homologous chromosomes swap segments, creating a new
combination of alleles on a single chromosome. Random segregation refers to the sorting of
homologous chromosomes to the daughter cells. This results in gametes that have some paternal and
maternal chromosomes in a haploid cell. Fertilization is random in the selection of individual alleles
that fuse to form a zygote.
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A) caddisflies B) shredders C) filtering collectors D) grazers
Which of the following types of cell cleavage is found most often for deuterostomes?
a. radial, indeterminate cleavage b. spiral, determinate cleavage c. radial, determinate cleavage d. spiral, indeterminate cleavage
Which enzyme adds new nucleotides to the end of a growing strand?
A. helicase B. polymerase C. gyrase D. ligase E. endonuclease
Which statement is incorrect?
A) Only living things maintain homeostasis. B) Only living things contain nucleic acids, proteins, carbohydrates, and lipids. C) Only living things can grow. D) Only living things are composed of cells.