Multiple choice

A free martin is a/an:

  1. monozygotic twin

  2. infertile female

  3. infertile male

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A freemartin is an infertile female mammal (usually cattle) born as a twin to a male. The placental connection allows male hormones to masculinize the female's reproductive tract, causing infertility. Freemartins are not monozygotic (identical) twins - they are dizygotic (fraternal). They are genetically female but reproductively malformed.

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