The pairing of homologous chromosomes
A. only occurs in mitosis.
B. is called synapsis.
C. is called crossing over.
D. occurs during telophase I.
E. occurs during anaphase II.
Answer: B
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A temperature-sensitive (ts) mutation is often due to a ________ mutation that affects protein folding or activity.
A) null B) nonsense C) missense D) silent
Transformation of bacteria was shown to occur when ________ bacteria were injected into mice and the mice ________.
A. live S strain; died B. live S and R strain; died C. live R strain and dead S strain; died D. live S strain and dead R strain; didn't die E. live R strain; didn't die
Aboveground shoots that develop from adventitious buds on roots are called:a
corms. b. crowns. c. plantlets. d. suckers. e. culms
Sperm nuclei are indicated by
a. A. b. B. c. C. d. D. e. E.