49. Prezygotic isolating mechanisms act to limit hybridization and maintain the genetic identity of closely-related species. For sympatric corals that do synchronized spawning, what is the most likely isolation mechanism?
(A) behavioral isolation
(B) temporal isolation
(C) habitat isolation
(D) gametic isolation
(E) hybrid breakdown

答案：登入後查看
統計： A(6), B(15), C(3), D(69), E(2) #1997408

詳解 (共 1 筆)

#6041547
49. Prezygotic isolating mechanisms act to limit hybridization and maintain the genetic identity of closely-related species. For sympatric corals that do synchronized spawning, what is the most likely isolation mechanism?
(A) behavioral isolation
兩種生物求偶儀式不同，藍腳鰹鳥踢出它藍色鮮艷顏色的腳腳求偶
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(B) temporal isolation 
兩種臭鼬地理分布相同，但在不同的時間季節交配 (S. gracilis在晚夏，S. putorius在晚冬)
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(C) habitat isolation
兩種果蠅在不同的地方交配，所以不太會遇到彼此 (R. pomonella在蘋果山楂上 R.mendax在藍莓上)
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(D) gametic isolation
精卵細胞無法在異種的生殖器官中生存 (課本例：Sea urchin)
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Mechanical Isolation
巴蝸牛屬(Bradybaena)，只能跟自己蝸牛殼同向螺旋的蝸牛交配。生殖器無法對齊。
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Reduced Hybrid Fertility
母馬，公驢雜交得到騾，不孕。
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Reduced Hybrid Viability
Ensatina屬的蠑螈偶而會成功交配，但是生出來的混種後代發育不全。
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(E) hybrid breakdown
第一代混種有生存繁殖能力，但當他與原生種交配時會不孕 (課本例：改良米)
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25. Two species of frogs belonging to the same genus occasionally mate, but the embryos stop developing after a day and then die. These two frog species separate by ______.
(A) gametic isolation
(B) reduced hybrid fertility
(C) hybrid breakdown
(D) mechanical isolation
(E) reduced hybrid viability
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