Baby A is born from a zygote when X chromosome of the sperm unites with an ovum . Baby B is born when Y chromosome unites with an ovum. Determine the sex of baby A and baby B.
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XX chromosomal pair determines that a child is a female. XY combination determines that the child is a male. Thus, an egg of a female will always contain and X chromosome. 50% of the sperms contain X chromosome and 50% of sperms contain Y chromosome. Thus when an egg is fertilized by a sperm containing X chromosome, the combination of XX is formed thus, giving birth to a girl child.
So, the correct answer is 'Girl'
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