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Unformatted text preview: reproduction Viparity: Egg laying • Oviparity – Laying initiates egg development Viviparity – initiation of egg development takes place in female Parthenogenesis • Females produce viable unfertilized eggs • Found in nearly all insect orders Leaf beetle genus Oreina • Found in Europe • All three reproductive strategies found in one genus 3 Parthenogenesis • Types – Obligatory – Facultative • Seasonal in aphids – Asexual reproduction during summer – Sexual reproduction in Spring and fall Variation in reproduction larvae O. variabilis eggs O. elongata larvae O. cacaliae Parthenogenesis in Hymenoptera • Sex determination – Haploid = male – Diploid = female • Mechanism – Female lets sperm fertilize eggs, female – With no fertilization, male Bumblebee life cycle Ant life cycle...
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- Spring '08