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After a culture of cells is allowed to multiply and is viewed through a microscope, the cells are x-rayed with high-energy radiation for less than 1/100th of a second. After the radiation, many newly reproduced cells appear different. What happened?
similar environmental factors
Mutation
three in four
sex cell
Populations sharing the same gene pool interbreed and create new species.
decreased disease resistance
genetically based
experience an increased risk of cancer
Wild cats such as cheetahs, lions, and tigers experience decreased genetic diversity as their populations decline and become fragmented due to habitat destruction. Decreased genetic diversity leads to populations with
similar environmental factors
Mutation
three in four
sex cell
Populations sharing the same gene pool interbreed and create new species.
decreased disease resistance
genetically based
experience an increased risk of cancer
External sources, such as radiation or chemicals, can cause mutations in genes or entire chromosomes. For a mutation to pass on to offspring, it must occur in a —
similar environmental factors
Mutation
three in four
sex cell
Populations sharing the same gene pool interbreed and create new species.
decreased disease resistance
genetically based
experience an increased risk of cancer
Which of the following statements describes the process of natural selection?
similar environmental factors
Mutation
three in four
sex cell
Populations sharing the same gene pool interbreed and create new species.
decreased disease resistance
genetically based
experience an increased risk of cancer
The chances of developing cancer, diabetes, or sickle-cell anemia are higher if a family member also has the disorder because they are —
similar environmental factors
Mutation
three in four
sex cell
Populations sharing the same gene pool interbreed and create new species.
decreased disease resistance
genetically based
experience an increased risk of cancer
In rabbits, short fur (F) is dominant to long fur (f). According to the Punnett square, what is the chance of two heterozygous short-haired rabbits having offspring with short fur?
similar environmental factors
Mutation
three in four
sex cell
Populations sharing the same gene pool interbreed and create new species.
decreased disease resistance
genetically based
experience an increased risk of cancer
People who have been exposed to excessive radiation often experience mutations. If these mutations only occur in somatic (body) cells, these people may —
similar environmental factors
Mutation
three in four
sex cell
Populations sharing the same gene pool interbreed and create new species.
decreased disease resistance
genetically based
experience an increased risk of cancer
Over many generations, unrelated or distantly related species may come to resemble each other due to —
similar environmental factors
Mutation
three in four
sex cell
Populations sharing the same gene pool interbreed and create new species.
decreased disease resistance
genetically based
experience an increased risk of cancer
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