A common trait found in orange tabby cats is the following: being awesome (A) is dominant to being average (a).
A male cat that is homozygous dominant for the A trait is mated with a female cat that is homozygous recessive.
For a cross with four offspring, what is the probability that they will have an offspring who is heterozygous?
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In this scenario, the male cat being homozygous dominant for the A trait means that all of his offspring will inherit an A allele from him. On the other hand, the female cat being homozygous recessive means that all of her offspring will inherit an a allele from her.
Since A is dominant to a, the only way for the offspring to be heterozygous is if they inherit one A allele from the male cat and one a allele from the female cat.
In a cross with four offspring, there are a total of 16 possible combinations of alleles that can be inherited (2^4 = 16). Out of these 16 possibilities, only 4 combinations (Aa, Aa, Aa, Aa) will result in the offspring being heterozygous.
Therefore, the probability of having an offspring who is heterozygous is 4/16, which can be simplified to 1/4 or 25%.
Answer: 1/4 or 25% probability