Which of the following events is unique to prophase I of meiosis?
a. Chromosome condensation.
b. Nuclear membrane breakdown,
c. Pairing of homologous chromosomes.
d. Assembly of a spindle apparatus.
Ans: c. Pairing of homologous chromosomes.
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A researcher runs a BLAST program comparing turkey phenylalanine hydroxylase, which functions in the metabolism of phenylalanine, with known database sequences. Which of the following should provide the closest match?
A. green pufferfish B. zebrafish C. chicken D. orangutan E. fruit fly
Which statement is true of embryonic splitting?
a. It never occurs in nature. b. It involves the genetic contribution of only one parent. c. It produces immediate differentiation. d. It is applied in animal husbandry to produce genetically diverse offspring. e. It produces identical twins.
Because oxygen is more electronegative than hydrogen, the water molecule is
A. ionic. B. nonpolar. C. hydrophilic. D. hydrophobic. E. polar.
Why is there a correlation between testis size and sperm competition in beetles?
What will be an ideal response?