In cats, the allele (B) for black tabby fur is dominant over the allele (b) for chocolate tabby fur.The total number of kittens produced by the given cross are 8.The number of kittens with black tabby fur will be:
Correct answer: C. 6
- A. 2
- B. 3
- C. 6
- D. 8
Explanation
In this scenario, the allele (B) for black tabby fur is dominant over the allele (b) for chocolate tabby fur. When considering the offspring from a genetic cross, the dominant trait tends to express more frequently if one or both parents carry the dominant allele (B). Out of 8 kittens, statistically, about 75% are expected to exhibit the dominant trait if both parents are heterozygous (Bb). Therefore, 6 out of 8 kittens would likely have black tabby fur. Option A (2) and Option B (3) underestimate the influence of the dominant allele. Option D (8) assumes all kittens will express the dominant trait, disregarding any potential recessive expressions.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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