Nondisjunction results in
A. two small daughter cells that disappear and two normal-sized cells.
B. two polar bodies.
C. daughter cells with different numbers of chromosomes.
D. two cells with equal numbers of chromosomes.
C. daughter cells with different numbers of chromosomes.
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The peppered moth provides a well-known example of natural selection. The light-colored form of the moth was predominant in England before the Industrial Revolution. In the mid-nineteenth century, a dark-colored form appeared. The difference is produced by a dominant allele of one gene. By about 1900, approximately 90% of the moths around industrial areas were dark colored, whereas light-colored moths were still abundant elsewhere. Apparently, birds could readily find the light moths against the soot-darkened background in industrial areas and, therefore, were eating more light moths. Recently, use of cleaner fuels has greatly reduced soot in the landscape, and the dark-colored moths have been disappearing. Should the two forms of moths be considered separate species?
A) Yes, because natural selection has affected the frequency of the two different forms. B) Yes, because they have completely different coloration. C) Yes, because they are reproductively isolated based on habitat. D) No.
Embryonic stem cells reach an intermediary level of determination at which they are committed to becoming a particular ______ type, but not necessarily a particular ____ type.
A. cell/tissue B. tissue/organ C. tissue/cell D. organ/tissue
Which best describes how these nucleotides are used during DNA replication?
A) They are joined to form proteins. B) They proofread the DNA to prevent errors. C) They are added to growing DNA strands following base-pairing rules. D) They are enzymes that break the hydrogen bonds, allowing the DNA molecule to unzip
In which two phases of mitosis does the nuclear membrane appear or disappear?
A. prophase and metaphase B. metaphase and anaphase C. prophase and anaphase D. prophase and telophase E. anaphase and telophase