Question

drag each label to the correct location on the table.

sort the examples into proper mechanisms of reproductive isolation.

prezygotic isolation | postzygotic isolation

the inability of red and purple sea urchins to mate due to gametic incompatibility
a sterile zonkey formed from the mating of a donkey and a zebra
different mating calls for two different grasshopper species
the death of a zygote after few weeks of formation

Explanation:

Define the types of reproductive isolation

Using the Reproductive Isolation knowledge point, we classify mechanisms preventing interbreeding into two categories:

• Prezygotic isolation: Barriers that prevent fertilization from occurring (before zygote formation).
• Postzygotic isolation: Barriers that occur after fertilization, affecting the viability or fertility of the hybrid offspring.

Analyze the gametic incompatibility example

Using the Reproductive Isolation knowledge point

$$ \text{Gametic incompatibility} \implies \text{Sperm and egg cannot fuse} \implies \text{No zygote forms} \implies \text{Prezygotic} $$

Analyze the zonkey example

Using the Reproductive Isolation knowledge point

$$ \text{Sterile hybrid offspring} \implies \text{Zygote formed and matured, but offspring cannot reproduce} \implies \text{Postzygotic} $$

Analyze the grasshopper mating calls example

Using the Behavioral Isolation and Reproductive Isolation knowledge points

$$ \text{Different mating calls} \implies \text{No mating attempt occurs due to behavioral differences} \implies \text{Prezygotic} $$

Analyze the zygote death example

Using the Reproductive Isolation knowledge point

$$ \text{Death of a zygote after formation} \implies \text{Zygote formed but is non-viable} \implies \text{Postzygotic} $$

Answer:

Prezygotic Isolation	Postzygotic Isolation
different mating calls for two different grasshopper species	the death of a zygote after few weeks of formation