Explain what causes aneuploidy
What will be an ideal response?
Nondisjunction is failure of homologous chromosomes or sister chromatids to separate in meiosis. This results in gametes with too few or too many chromosomes. When these participate in fertilization, the zygote that results has too few or too many chromosomes and is aneuploid.
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How do archaea differ from bacteria? What will be an ideal response?
Proto-cells are considered to have
a. been simple membrane-bound sacs. b. been able to capture energy c. been able to engage in metabolism. d. been able to reproduce. e. all of these.
The last structure that air moves through in mammals
before entering the alveoli is (are) the a. larynx. b. bronchi. c. bronchioles. d. trachea. e. pharynx.
Genetic variation associated with meiosis is manifested as
a. new combinations of alleles due to crossing over. b. random movement of homologous pairs of chromosomes moving to spindle poles. c. random chance playing a role when a sperm fertilizes an egg. d. diploid cells expressing various traits. e. a, b, and c.