The white spotting is caused by the S gene (“S” stands for spotting), which has 2 alleles: big S (spotting) and little s (no spotting). The big S allele is dominant, so if there is at least one S allele (SS or Ss), the cat will have white spots. Calix has white spots, so he definitely has at least one big S allele. The rest of the fur color is controlled by the O gene that also has 2 alleles: big O (orange fur) and little o (black fur). The O gene is on the X chromosome. Males only have one X chromosome, so they can only have one allele for the O gene. They can either be orange (O) or black (o). Females have two X chromosomes, so they can have two alleles for the O gene. If they have two O alleles (OO), they are orange. If they have two o alleles (oo), they are black. If they have one of each allele (Oo), they have both orange and black fur. female: XX male:XY Which of the following fur colors are possible in males? Choose all that apply. Remember that the S gene for white spots is on an autosome, and the O gene is on the X chromosome. Black Black and White Black, Orange, and White Orange Orange and White
The white spotting is caused by the S gene (“S” stands for spotting), which has 2 alleles: big S (spotting) and little s (no spotting). The big S allele is dominant, so if there is at least one S allele (SS or Ss), the cat will have white spots. Calix has white spots, so he definitely has at least one big S allele. The rest of the fur color is controlled by the O gene that also has 2 alleles: big O (orange fur) and little o (black fur). The O gene is on the X chromosome. Males only have one X chromosome, so they can only have one allele for the O gene. They can either be orange (O) or black (o). Females have two X chromosomes, so they can have two alleles for the O gene. If they have two O alleles (OO), they are orange. If they have two o alleles (oo), they are black. If they have one of each allele (Oo), they have both orange and black fur.
female: XX male:XY
Which of the following fur colors are possible in males? Choose all that apply. Remember that the S gene for white spots is on an autosome, and the O gene is on the X chromosome.
Black
Black and White
Black, Orange, and White
Orange
Orange and White
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