The Shape of the Beak of a Hummingbird (Very Long

question 4

Multiple Choice

The shape of the beak of a hummingbird (very long and thin) and that of a finch (short and fat) is controlled by the same set of genes. Which of the following could account for the differences between these two bird beaks?

• A)Apoptosis occurs in the beak of the finch, but not in the beak of the hummingbird.
• B)Although development is controlled by the same genes, the genes produce different proteins and those proteins cause development to occur in different ways.
• C)The hummingbird retains stem cells for a longer period of time during development than does the finch.
• D)The genes involved in determining beak shape stay on for different lengths of time in each bird.

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