It is the mother's ovum that determines whether the developing baby will become a boy or a girl.
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Q171: The most common extra-chromosome condition is fragile
Q172: Dizygotic twins originate from the same zygote;
Q173: The basic unit on a chromosome that
Q174: When the effects of genes add up
Q175: Due to biological sex (XX or XY),
Q177: Consultation and testing by trained experts that
Q178: An individual's phenotype is dependent entirely on
Q179: Heritability indicates how much of the variation
Q180: The cells that result from the early
Q181: No human trait is determined by genes
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