Y

chromosome

Czarina

A female, she had two X chromosomes, thus two copies of the hemophilia gene. She had one normal allele and one recessive allele.

No hemophilia

Egg cells

Romanov daughters

They may or may not have carried the recessive allele but had at least one copy of the normal allele.

No hemophilia

Czar

A male, he had only one X chromosome, thus only one copy of the hemophilia gene. He had a normal allele.

No hemophilia

Normal Recessive allele allele

Normal allele

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