1.When a human embryo is developing, the embryo produces a special type of hemoglobin not found in infant, child, or adult blood. Which statement best explains how an embryo can produce a different type of hemoglobin from that of an infant, child, or adult?
A.Humans have genes for different types of hemoglobin, and they are expressed at different times.
B.An embryo and an adult have different genes for hemoglobin.
C.As the embryo develops and cells differentiate, certain genes are lost.
D.Human genes change slowly as a person ages.
2.Which situation would most likely result in evolution?
A.A green parrot has an allele for green feathers and an allele for blue feathers.
B.A butterfly predator sees yellow more easily than it does green, and a population of butterflies includes both phenotypes.
C.A large population continues to grow larger.
D.A single individual dies in a large population.
2007-06-05
05:49:40
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4 answers
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asked by
isummerlover
1
in
Biology