A male mouse with genotype Igf2 Igf2m is crossed with a female who is Igf2 Igf2. What would be the expected outcome of this cross? All offspring would be normal because the paternal allele is expressed 1/2 the offspring would be normal; 1/2 would be dwarf All offspring would be dwarf because the maternal allele is silenced 3/4 of the offspring would be normal; 1/4 would be dwarf All offspring would be dwarf because the paternal allele is silenced
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
A male mouse with genotype Igf2 Igf2m is crossed with a female who is Igf2 Igf2. What would be the expected outcome of this cross?
- All offspring would be normal because the paternal allele is expressed
- 1/2 the offspring would be normal; 1/2 would be dwarf
- All offspring would be dwarf because the maternal allele is silenced
- 3/4 of the offspring would be normal; 1/4 would be dwarf
- All offspring would be dwarf because the paternal allele is silenced
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