Long hair is recessive in cats. Which of the following Punnett squares shows a cross that would result in the probability that 75% of the offspring will have short hair?
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The mating of two LS cats would give you 75% short hair.
To determine the Punnett square that shows a cross resulting in a 75% probability of offspring with short hair, we need to understand the inheritance pattern for long hair in cats.
Given that long hair is a recessive trait, it is represented by the lowercase letter 'l', while short hair is the dominant trait represented by the uppercase letter 'L'. When an individual has a pair of alleles containing at least one dominant (L) allele, they will have short hair. However, if an individual has two recessive (ll) alleles, they will have long hair.
Now, let's analyze the Punnett squares and find the one that meets the criteria of a 75% probability of short-haired offspring:
Punnett square A:
LL x ll
Ll Ll
Ll Ll
Punnett square B:
LL x Ll
LL LL
Ll Ll
Punnett square C:
Ll x Ll
LL Ll
Ll ll
In Punnett square A, all offspring have short hair since both parents have at least one dominant allele. Thus, the probability of short-haired offspring in Punnett square A is 100%.
In Punnett square B, both parents have at least one dominant allele, resulting in all offspring having short hair. Hence, the probability of short-haired offspring in Punnett square B is also 100%.
In Punnett square C, 50% of the offspring have short hair (LL and Ll), while the other 50% have long hair (ll). Therefore, the probability of short-haired offspring in Punnett square C is 50%.
Considering the probabilities calculated for Punnett squares A, B, and C, none of them meet the requirement of a 75% probability of short-haired offspring. So, none of the provided Punnett squares match the desired criteria.