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- Which of the following changes are most likely to occur in a male songbird that has a mutation in the cells in its anterior pituitary gland such that FSH and LH are produced at 1% of normal levels? increased courtship displays to attract females decreased GnRH production increased testosterone production decreased frequency of "singing" to attract females Submit Request AnswerLarge testes are probably advantageous in species with sperm competition because larger testes produce more sperm which increses males' probability of fertilization females choose males based on testes size more testosterone production increases fighting ability of males larger testes produce larger sized sperm which have a competitive advantage over other spermWhat does VMN do in males VS females in vertebrates?
- In sharks hormones regulate which of the following functions? Digestion Growth Stress responses Lactation The lymphatic system Smell Defecation Osmoregulation Reproduction Color change and bioluminescence Leckking behaviourDescribe hormonal control of metamorphosis in insects, including the action of each hormone and where each is producedAnimals 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
- Female spotted sandpipers aggressively court males and, aftermating, leave the clutch of young for the male to incubate. Thissequence may be repeated several times with different males untilno available males remain, forcing the female to incubate her lastclutch. Which of the following terms best describes this behavior?(A) polygyny(B) polyandry(C) promiscuity(D) certainty of paternityWe 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 hermaphroditic all of the above nudibranchs (the "penis fencers") coral reef fishSpiders Use venom to liquefy the protein rich bodies of their prey O Exchange respiratory gases through spines on their legs O Typically use their mandibles to shred prey before swallowing the pieces All of the above Fertilize eggs after they are laid by the female (spawning)
- In sea urchin, which step of egg and sperm recognition is mediated by sperm-activating peptides? Sperm migration through the egg ECM Fusion of the sperm and egg membranes Sperm binding to the egg's ECM Acrosomal reaction Chemo-attractionParasites are often microscopic in size but have large negative effects on their hosts. If this is true for the parasites of songbirds, what predictions follow about their effects on male song performance, and how should females respond to the song of infected males as opposed to uninfected individuals (Garamszegi 2005)? (Don't use any online source)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.