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

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) .