True or False? Mutations are a source of genetic variation (differences) in a species. O True False

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Ho can organisms. in the same environment have different selection pressures?

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Question 14 Saving. Organismo may not be perfectly adapted to their environments for which of the following reasons: Physical constraints that cannot be overcome. Because natural selection cannot anticipate future conditions, adaptati on lags at least one generation behi nd any environmental changes that occur. The same trait may face contradictory selection pressures (e.g., large/sexy fins vs small/fast fins) There may not be any geneti c variation available for evolution of certain traits that woul d provide a fitness advantage if they were present. All of the above.

Part A Why is mimicry evolutionarily advantageous (helpful/beneficial)? U =- E E XA PLAY

Mutations O do not cause evolutionary change. O occur because an organism has a need. O do not lead to adaptation. O result in genetic variation.

The ozone layer of Earth's atmosphere helps to filter ultraviolet radiation. As the ozone layer is depleted, more ultraviolet radiation reaches Earth's surface. This increase in ultraviolet radiation may be harmful because it can directly cause * O photosynthesis to stop in all marine organisms abnormal migration patterns in waterfowl mutations in the DNA of organisms O sterility in most species of mammals and birds

? QUESTION Kaylee Kouff. Genes and Protein Synthesis 157 Evolution Biologists define evolution as the change in the frequency of alleles (variations of a gene) in a population. Consider the following situation: Two colors of grasshoppers-brown and red-result from the two variations (alleles) of the color gene in this species. These grasshoppers live in two areas: an area with brown soil, and on an adjacent mountain with reddish soil. All the grasshoppers in both areas were accidentally killed by a fire. ► Ecologists re-introduced 1000 red and 1000 brown grasshoppers into each of the two soil areas. And, grasshoppers are a great food source for any bird that can catch them. 1. What do you think the ecologists discovered when they returned to the experimental sites five years later? Babies from the red and browns grasshoppers 2. What factor controls the actual color of a grasshopper? Depends if the color is a ماماله dominant 3. What determines the color frequency of grasshoppers in the…

True or false? Humans are among the most genetically similar species in the world.