In dogs, black coat colour (B) is dominant over yellow coat colour (b), and straight fur (C) is dominant over curly fur (c).In a cross between two BbCc parents, the predicted fraction of offspring with black coat colour and straight fur would be:
Correct answer: C. 9/16
- A. 3/4
- B. 1/4
- C. 9/16
- D. 1/16
Explanation
The predicted fraction of offspring with black coat color and straight fur in a cross between two BbCc parents is 9/16. This is because the traits are independently assorted, and the probability of a black coat (B) is 3/4 and the probability of straight fur (C) is 3/4. Therefore, the probability of both occurring together is (3/4) * (3/4) = 9/16. So option C is correct. The rest of the options give wrong probabilities.
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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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