Question: In mice the gene for two eye color has two alleles. The allele for black eyes is dominant while the allele for red eyes is dominant. Choose a suitable symbol for these alleles, and then draw a diagram to show the probable results of the cross between a heterozygous black eyed mouse and a red eyed mouse. Edit
Answer: Cross 1: black eyes X red eyes gives all black eyes – a likely model is that eye color is controlled by one gene that has 2 alleles resulting in two phenotypes, black eyes and redeyes. The black eyed phenotype is likely to be dominant. Therefore, choose appropriate symbols (one letter per gene, capital letter for allele with dominant phenotype):B - black allele. Dominant phenotype of black eyes.b - red allele. Recessive phenotype of red eyes.
Cross 1 is then: BB X bb ----> all Bb (all black eyes).
Cross 2 is then: Bb X Bb ----> 3:1 black:red.
The predictions agree with the data. Edit
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