List and briefly explain the three ways in which genetic variability is increased during meiosis
What will be an ideal response?
ANSWER: Meiosis increases genetic variability in three ways: recombination, independent assortment,
and random fertilization. Recombination occurs when homologous chromosomes swap
segments, creating a new combination of alleles on each chromosome. Independent
assortment refers to the random sorting of homologous chromosomes to the daughter cells.
This results in gametes that can have both paternal and maternal chromosomes in a haploid
cell. Fertilization is random in the joining of male and female gametes that fuse to form a
zygote.
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Which external factors influence a cell to divide?
What will be an ideal response?
Plasma is mostly
a. proteins. b. salts. c. water. d. fats. e. hormones.
What is happening here? Water + NaCl ® Na+ + Cl-
A. A solution of ions is prepared. B. The dissociation of ions. C. Movement of an electron from the outermost energy level of Na to the outermost energy level of Cl. D. All the choices are true.
The respiratory membrane is a combination of
A) bronchi and air sacs. B) bronchioles and capillary walls. C) alveolar and capillary walls. D) bronchi and bronchioles. E) bronchioles and air sacs.