Consider two mice that are heterozygous for insulin-like growth
factor 2. . . I'm at a loss. 
Homework Answers
a. The genotypic ratio will be 1:2:1
b. The phenotypic ratio will be 1:1
These can be explained by drawing a punnet square.
Here the cross is: igf2igf2m X igf2igf2m
The the gametes produced by both the parents will be: igf2 and igf2m therefore punnet square will be as follows:
| Igf2 | igf2m | |
| Igf2 | igf2igf2 | igf2igf2m |
| Igf2m | igf2igf2m | igf2migf2m |
Here it is clear from punnet square, the genotypic ratio is 1:2:1.
The genes inherited from father will most likely be the ones that are expressed as a result of genomic imprinting. Since the alleles trom the father are the only one that will be inherited, it will produce a defective or functional protein.
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