Parthenogenesis Is a Type of Asexual Reproduction in Which Embryos

question 7

Multiple Choice

Parthenogenesis is a type of asexual reproduction in which embryos can be established and grow without fertilization.Essentially,this means that an embryo develops from an unfertilized egg.What is the most likely reason why the parthenogenetic whiptail lizards of the desert Southwest create no new genetic combinations during crossing-over,whereas other animals do?

• A) In this species, all the crossovers are double, eventually restoring each chromosome to its
• Original condition.
• B) The lizards have no homologous chromosomes. In this species, crossing-over takes place between genetically identical sister chromatids; therefore, no changes occur.
• C) Parthenogenetic species forgo meiosis I, the stage in which crossing-over normally occurs.
• D) Accumulated mutations within this species have modified the centromeres, disrupted the formation of a bivalent, and prevented crossing-over from taking place.

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