In Mendelian cross for the heterozygous flower, what is the probability that the dominant allele will be in sperm and the recessive in the egg:
Correct answer: C. 0.25
- A. 0.05
- B. 0.5
- C. 0.25
- D. 0.7
Explanation
In a Mendelian cross involving a heterozygous flower (say, Rr, where:R = dominant allele (e.g., red color)r = recessive allele (e.g., white color)We want the probability that:The sperm carries the dominant allele (R)The egg carries the recessive allele (r)Step-by-step Explanation:In a heterozygous (Rr) individual:Probability of sperm carrying R = ½Probability of egg carrying r = ½Since the sperm and egg assort independently (law of independent assortment), we multiply the probabilities:P(sperm = R and egg = r) = ½ × ½ = ¼
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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