Cross two heterozygous black mice and tell the possible phenotypes and genotypes in their offspring.

1 trait cross

4 squares

2 different phenotypes

 Phenotype     Count     Percent  

[ pA ]        375

[ pa ]        125

1 trait cross

4 squares

3 unique allele combinations

 Genotype     Count     Percent  

aA250

AA125

aa125

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).