We discussed environmental sex determination in reptiles, where the sex of the individual is determined by environmental factors rather than chromosomes. Which of the following modes of sex determination would also fit that category? hermaphroditic earthworms hermaphroditic nudibranchs (the "penis fencers") hermaphroditic coral reef fish all of the above
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- In frog neurulation the notochord _______ the formation of the _______ in the ectoderm next to it. Group of answer choices expresses, neural plate induces, neural plate induces, somites expresses, somitesShown here are graphs that plot the percentage of fertilizedeggs containing males against the atmospheric temperatureduring early development in (a) snapping turtles and (b) mostlizards. Interpret these data as they relate to the effect oftemperature on sex determination.Fishes and some species of amphibians like frogs fertilize their eggs outside of their body. Which of the following statements is TRUE about external fertilization? * A small number of gametes need to be produced by the male and female to ensure reproductive success It produces a small number of offspring compared to internal fertilization A body of water is not required no answer Chances of fertilization are diminished by environmental hazards and Predators
- Which of these is an example of asexual reproduction? A hermaphrodite mating with another hermaphrodide A female lizard producing embryos via parthenogenesis Different corals producing either sperm or eggs and releasing them into the water during spawning where they are fertilized externally Mating between a male and female birds. This experiment is an example of a research approach in which scientists infer how something works normally based on what happens when the normal process is blocked. What normal process was blocked in Jost’s experiment? From the results, what inference can you make about the role of the gonads in controlling the development of mammalian genitalia?Animals attract mates through a variety of behaviors. Diurnal animals tend to rely on visual cues, while nocturnal ones make frequent use of pheromones. In recent years, environmental pollutants called endocrine disruptors are on the rise. Such chemicals mimic hormones in higher-order animals and interfere with the reproductive cycle. Which animal’s reproduction would be most seriously affected in the presence of endocrine disruptors? rats bees fireflies fiddler crabs
- Show a model of female reproductive system of turtle showing structures and pathways during ovipositionDescribe how the reproductive structures of each organism are adapted towards the given characteristics of the animals: 1. Solitary and slow-moving lifestyle of Lissachatina fulica 2. Saltatory mode of life in Rhinella marina 3. Temperature regulation of mammalian sperm cell productionFigure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false?a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries.b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken.c. Both progesterone and estrogen are produced by the follicles.d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.
- In seahorses, males incubate and care for offspring. Thus, the males are more likely to be tied up in reproduction at any point in time relative to females. Which sex do you predict will be the choosey sex in this species and why? Males -- because fewer are available to mate Males – because male-male competition is incredibly strong Females – because sperm are cheap to produce Female – because the operational sex ratio is biased in their favor The sperm of chimpanzees have faster swimming speeds than those of gorillas. Based on what you know about sperm competition, what would you predict about differences between these two species in female re-mating frequency and sperm viability? In chimps, females mate only once and sperm are viable for only a day In chimps, females mate multiply and sperm live for a long time In chimps, females mate only one, and sperm live for a long time In chimps, females mate multiply, and sperm live for only a day Which of the following sexual traits is…"Skates and chimeras are oviparous, whereas rays and many sharks are viviparous. Being viviparous means that they _____." Have internal fertilization Have external fertilzation Give birth to live young Lay eggsWhich statement about menopause is most correct? A. Menopause has to be adaptive because life-history theory predicts that women should not outlive their reproductive capacity, so menopause must have some function. B. Menopause has to be adaptive because humans, not chimpanzees, experience menopause, and humans are evolutionarily more advanced than chimps. C. Several hypotheses for menopause as an adaptation have been proposed, but more evidence is necessary to support any one of them. D. Several hypotheses for menopause as an adaptation have been proposed, but they have not been tested.