Rocky Mountain Juniper (Juniperus Scopulorum)and One-Seeded Juniper (J

question 49

Multiple Choice

Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J.monosperma) have overlapping ranges.If pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species,then which of these terms is applicable?

• A)behavioural isolation
• B)mechanical isolation
• C)temporal isolation
• D)hybrid breakdown
• E)reduced hybrid viability

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