All of the following are examples of prezygotic genetic isolating mechanisms EXCEPT: a. Male fireflies of different species have differing flash patterns. b. Three closely related orchid species flower on different days. c. The progeny of a cross between two different lizard species fail to develop properly. d. One species of snake lives in water and another is terrestrial. e. Peeper frogs mate in April, and tree frogs mate in June.
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Step 1: Understand the concept of prezygotic genetic isolating mechanisms, which are mechanisms that prevent fertilization between different species. Show more…
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Prezygotic isolating mechanisms prevent hybrid offspring from occurring between species because (a) the resulting offspring are not fertile and cannot reproduce. (b) the egg and sperm fuse and form a zygote, but it does not survive. (c) the egg and sperm do not ever meet or, if they do, cannot fuse to form a zygote. (d) all of the above
Adi S.
Decide whether each of the following scenarios represent a prezygotic or postzygotic isolating mechanism: a) Two bird populations have such different mating calls that they never mate with each other b) One population of frogs mates in March, and the other population mates in August c) Sheep and goats can mate, but their chromosomes are misaligned, so a zygote never forms d) Mating a horse and a donkey produces a mule, which is sterile e) Two populations of snakes never meet because they are separated by a mountain range
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Identify each of the following reproductive barriers as prezygotic or postzygotic. a. One lilac species lives on acidic soil, another on basic soil. b. Mallard and pintail ducks mate at different times of the year. c. Two species of leopard frogs have different mating calls. d. Hybrid offspring of two species of jimsonweed always die before reproducing. e. Pollen of one kind of pine tree cannot fertilize another kind.
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