Upon examination of a zygote, a developmental biologist discovers that it possesses 69 chromosomes. What does this indicate?
A. The zygote is a normal, healthy diploid zygote
B. Either the sperm or the egg received an extra sex chromosome as the result of a meiotic error
C. Either the sperm or the egg received an extra chromosome as the result of a meiotic error
D. The zygote resulted from polyspermy (multiple fertilizations of the same oocyte) by two sperm cells
Answer: D
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