A set of twins made up of a boy and a girl results when two ova were respectively fertilized by two spermatozoa...

Question

85 votes

Answer 1

each carrying both an X and a Y chromosome

27% / 23 votes

Answer 2

each carrying a Y chromosome

2% / 2 votes

Answer 3

each carrying two X chromosome

1% / 1 vote

Answer 4

each carrying two Y chromosome

1% / 1 vote

Answer 5

one carrying a Y chromosome and the other a X chromosome

68% / 58 votes

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