Concept explainers
WHAT IF? Suppose you are studying two bird species that live in a forest and are not known to interbreed. One species feeds and mates in the treetops and the other on the ground. But in captivity, the birds can interbreed and produce viable, fertile offspring. What type of reproductive barrier most likely keeps these species separate in nature? Explain
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- Grasshopper's environment pressures: What obstacles in regard to finding food, habitat, climate, mating? How does it deal with these pressures?arrow_forwardWHAT IF? Suppose males in the first mating had a mutant allele thatresulted in smaller eyes as a dominant trait (see Concept 14.1). What fractionof the females would produce some offspring with smaller eyes?arrow_forwardWHAT IF? Suppose the digger wasp had returned to her original nest site,despite the pinecones having been moved. What alternative hypotheses mightyou propose regarding how the wasp finds her nest and why the pineconesdidn’t misdirect the wasp?arrow_forward
- WHAT IF? Suppose you were studying a species thathas a population cycle of about ten years. How longwould you need to study the species to determine if itspopulation size were declining? Explain.arrow_forwardWHAT IF? Suppose gene A is orthologous in species 1and species 2, and gene B is paralogous to gene A inspecies 1. Suggest a sequence of two evolutionary eventsthat could result in the following: Gene A differs considerably between species, yet gene A and gene B show littledivergence from each other.arrow_forwardMAKE CONNECTIONS Commercial fisheries targetolder, larger cod fish, causing cod that reproduce at ayounger age and smaller size to be favored by naturalselection. Younger, smaller cod have fewer offspring thando older, larger cod. Predict how evolution in responseto fishing would affect the ability of a cod populationto recover from overfishing. What other reciprocal ecoevolutionary effects might occur? (See Concept 23.3.)arrow_forward
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