A great variety of transposable elements exist in eukaryotes. Some resemble transposable elements in prokaryotes, having terminal inverted repeats, and transpose as DNA. Others are retrotransposons with long direct repeats at their ends and transpose through an RNA intermediate -Hybrid dysgenesis results when A) a male fly with P elements (P⁺) mates with a female fly that lacks P elements (P^-). B) a P^- male mates with a P⁺ female. C) a P⁺ male mates with a P⁺ female. D) a P^- male mates with a P^- female

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Hybrid dysgenesis occurs when a male fly with P elements (P⁺) mates with a female fly that lacks P elements (P⁻), leading to sterility and mutations in the offspring due to the activation of transposable elements.

A Great Variety of Transposable Elements Exist in Eukaryotes