Scientists Have Found That the IGF1 Gene,which Encodes a Growth

question 26

Multiple Choice

Scientists have found that the IGF1 gene,which encodes a growth hormone,has one allele (IGF1-A) that is commonly found in small dogs,but is nearly absent from dogs that are very large.Based on this finding,what can you conclude about the relationship between IGF1-A and body size in dogs?

• A)Body size in dogs depends upon whether a dog is homo- or heterozygous for IGF1-A.Dogs that are homozygous (two copies of IGF1-A)tend to grow larger than dogs that are heterozygous (only one copy of IGF1-A).
• B)Body size in dogs depends on whether or not the IGF1-A allele is present.A dog with IGF1-A will tend to grow larger than a dog without IGF1-A.
• C)Body size in dogs depends on whether or not the IGF1-A allele is present.A dog with IGF1-A will tend to be smaller than a dog without IGF1-A.
• D)Small dogs have more growth hormone released during fetal development,but none released after the birthing process.
• E)Body size in dogs depends upon whether a dog is homo- or heterozygous for IGF1-A.Dogs that are homozygous (two copies of IGF1-A)tend to be smaller than dogs that are heterozygous (only one copy of IGF1-A).

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