In mice, black coat color (B) is dominant over brown (b), and a solid pattern (S) is dominant to white spotted (s). Color and spotting are controlled by genes that assort independently. A homozygous black spotted mouse is crossed with a homozygous brown solid mouse. All of the F1 mice are black and solid. In biology class one day you see a black solid mouse run across your desk. You and your classmates manage to trap the mouse and decide to attempt to discover it’s genotype. In order to do this you perform a testcross with a laboratory mouse. You perform the testcross and find that ½ of the offspring from the testcross are black and solid and ½ are black and spotted. What is the genotype of the classroom mouse?
In mice, black coat color (B) is dominant over brown (b), and a solid pattern (S) is dominant to white spotted (s). Color and spotting are controlled by genes that assort independently. A homozygous black spotted mouse is crossed with a homozygous brown solid mouse. All of the F1 mice are black and solid. In biology class one day you see a black solid mouse run across your desk. You and your classmates manage to trap the mouse and decide to attempt to discover it’s genotype. In order to do this you perform a testcross with a laboratory mouse.
You perform the testcross and find that ½ of the offspring from the testcross are black and solid and ½ are black and spotted. What is the genotype of the classroom mouse?
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