During mitosis and meiosis, DNA is duplicated, chromosomes separate, and cytoplasm divides. How are mitosis and meiosis different?
A) Meiosis occurs only in plant cells as mitosis occurs only in animal cells.
B) Meiosis creates diploid daughter cells and mitosis creates haploid cells.
C) Meiosis only occurs in zygotes after fertilization and mitosis occurs only in the embryo.
D) Meiosis creates haploid daughter cells and mitosis creates diploid cells.
Ans: D) Meiosis creates haploid daughter cells and mitosis creates diploid cells.
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What happens when two populations become geographically separated from each other and then genetic divergence occurs?
A) Continental drift B) Allopatric speciation C) Temporal isolation D) Sympatric speciation E) The founder effect
In organogenesis, which of the following is a precursor structure to the brain and spinal cord?
a. notochord b. somites c. neural tube d. cloaca
X-ray diffraction studies are used to determine the:a
sequence of amino acids in protein molecules. b. sequence of nucleotides in nucleic acid molecules. c. distances between atoms of molecules. d. identity of an unknown chemical. e. wavelength of X-rays.
Which of the following is an example of an effect of natural selection.
A. all of the children of two parents are male. B. carbon cycles through ecosystem. C. favorable environmental conditions cause an increased food supply. D. polar bears have white fur.