Difficulty: Hard

Average Score: 48%

Domestic cats exhibit a great variety of coat characteristics. Two important genes governing cat coat traits are the white masking gene and the gene for fur length. The alleles for these traits are:
W - dominant allele for white masking, produces solid white fur
w - recessive allele, produces colored fur
L - dominant allele for fur length, produces short hair
I - recessive allele, produces long hair

The Punnett square below shows a cross between a male long-haired cat with white fur and a female short-haired cat with colored fur... what is the most likely number of long-haired kittens with colored fur?

Rationale

10

In this genetic cross, the male long-haired cat with white fur and the female short-haired cat with colored fur are likely to produce a certain ratio of long-haired to short-haired kittens, with the most probable number being 10, based on the typical outcomes from such Punnett square predictions.

A (10) CORRECT

The Punnett square indicates that with the given genetic traits, 10 long-haired kittens with colored fur is the expected outcome. This aligns with the typical ratios observed in similar genetic crosses, where dominant and recessive traits determine the phenotypic distribution of offspring.

B (20) YOUR ANSWER

Choosing 20 as the number of long-haired kittens with colored fur suggests a misinterpretation of the genetic ratios. While it is possible to have some variability in outcomes, the specific traits of the parents indicate that such a number exceeds the expected probability given the Punnett square analysis.

C (30) YOUR ANSWER

Selecting 30 implies a significant overestimation of the long-haired kittens. The genetic cross reflects a more specific ratio that does not support such a high number of long-haired kittens, as the dominant traits present would lead to fewer long-haired offspring than indicated.

D (60) YOUR ANSWER

Opting for 60 long-haired kittens represents a dramatic miscalculation of the expected genetic distribution. The probabilities derived from the Punnett square are far lower, and such a high count does not align with the typical ratios seen in these genetic scenarios.

Conclusion

In this genetic cross, the analysis via the Punnett square reveals that the most likely outcome for long-haired kittens with colored fur is 10, corresponding to the expected phenotypic ratios. The other choices reflect misunderstandings of genetic inheritance patterns, emphasizing the importance of accurate interpretation of Punnett squares in predicting offspring traits.

The Punnett square below shows a cross between a male long-haired cat with white fur and a female short-haired cat with colored fur... what is the most likely number of long-haired kittens with colored fur?

10

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