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Questions and Answers
A shark species is found to have embryos developing inside eggs that hatch within the mother's uterus, with the young being nourished by the egg yolk. Which reproductive strategy does this shark employ?
A shark species is found to have embryos developing inside eggs that hatch within the mother's uterus, with the young being nourished by the egg yolk. Which reproductive strategy does this shark employ?
- Oviparous
- Ovoviviparous (correct)
- Parthenogenesis
- Viviparous
In which reproductive strategy do shark embryos receive nourishment directly from the mother's bloodstream via a yolk sac placenta?
In which reproductive strategy do shark embryos receive nourishment directly from the mother's bloodstream via a yolk sac placenta?
- Viviparity (correct)
- Ovoviviparity
- Asexual reproduction
- Oviparity
If a shark egg hatches outside the mother's body, which reproductive strategy is being used?
If a shark egg hatches outside the mother's body, which reproductive strategy is being used?
- Ovoviviparous
- Asexual
- Viviparous
- Oviparous (correct)
What is the function of the cloaca in sharks?
What is the function of the cloaca in sharks?
A biologist discovers a new shark species. Upon examination, it's found that the embryos develop in eggs inside the mother, but they are not nourished by her directly. How would this shark's reproductive strategy be classified?
A biologist discovers a new shark species. Upon examination, it's found that the embryos develop in eggs inside the mother, but they are not nourished by her directly. How would this shark's reproductive strategy be classified?
A marine researcher is studying a population of sharks and observes that the females lay eggs that are then attached to seaweed. What reproductive strategy are those sharks employing?
A marine researcher is studying a population of sharks and observes that the females lay eggs that are then attached to seaweed. What reproductive strategy are those sharks employing?
Which of the following is a key difference between ovoviviparity and viviparity in sharks?
Which of the following is a key difference between ovoviviparity and viviparity in sharks?
How might environmental changes affecting yolk sac quality most directly impact shark populations?
How might environmental changes affecting yolk sac quality most directly impact shark populations?
Which sharks would be most affected by a disease targeting the placenta?
Which sharks would be most affected by a disease targeting the placenta?
If a specific toxin accumulates in the yolk of shark eggs, which reproductive strategy would lead to the greatest exposure of the developing embryo to this toxin?
If a specific toxin accumulates in the yolk of shark eggs, which reproductive strategy would lead to the greatest exposure of the developing embryo to this toxin?
A researcher is investigating the evolutionary relationships among different shark species. Which of the following reproductive traits would provide the strongest evidence that two shark species are closely related?
A researcher is investigating the evolutionary relationships among different shark species. Which of the following reproductive traits would provide the strongest evidence that two shark species are closely related?
In the context of shark reproduction, what is the significance of internal fertilization?
In the context of shark reproduction, what is the significance of internal fertilization?
How does the oviparous reproductive strategy potentially benefit shark populations in unstable environments?
How does the oviparous reproductive strategy potentially benefit shark populations in unstable environments?
Which of the following is a potential disadvantage of viviparity for sharks compared to oviparity?
Which of the following is a potential disadvantage of viviparity for sharks compared to oviparity?
A scientist discovers a new species of shark that exhibits a mix of reproductive strategies, utilizing oviparity in some years and ovoviviparity in others. What evolutionary pressure might lead to such a mixed strategy?
A scientist discovers a new species of shark that exhibits a mix of reproductive strategies, utilizing oviparity in some years and ovoviviparity in others. What evolutionary pressure might lead to such a mixed strategy?
How does the cloaca’s function in sharks differ from that in mammals?
How does the cloaca’s function in sharks differ from that in mammals?
Which of the following scenarios would most likely lead to the evolution of viviparity from oviparity in a shark population?
Which of the following scenarios would most likely lead to the evolution of viviparity from oviparity in a shark population?
What impact does the presence of a cloaca have on the potential for reproductive isolation in sharks?
What impact does the presence of a cloaca have on the potential for reproductive isolation in sharks?
In a shark species that exhibits viviparity, what might be the consequence of a genetic mutation that impairs the function of the yolk sac placenta?
In a shark species that exhibits viviparity, what might be the consequence of a genetic mutation that impairs the function of the yolk sac placenta?
Considering the different reproductive strategies of sharks, which strategy would be the most energy-intensive for the mother?
Considering the different reproductive strategies of sharks, which strategy would be the most energy-intensive for the mother?
Flashcards
Oviparous Sharks
Oviparous Sharks
Embryos develop inside eggs that hatch outside the mother's body.
Ovoviviparous Sharks
Ovoviviparous Sharks
Embryos develop within the uterus, nourished by the egg yolk, and are born live.
Viviparous Sharks
Viviparous Sharks
Embryos develop within the uterus and are nourished through a yolk sac placenta from the mother's blood, resulting in live birth.
Cloaca
Cloaca
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Study Notes
- Shark eggs undergo internal fertilization.
- Embryonic development varies:
Oviparous
- Eggs hatch externally.
Ovoviviparous
- Embryo develops in the uterus.
- Nourishment is derived from the egg yolk.
Viviparous
- Embryo develops in the uterus.
- Nourishment comes via a yolk sac placenta connected to the mother's blood supply.
- The reproductive, excretory, and digestive systems converge into a cloaca.
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