Two genes in tomatoes are 61 mu apart: normal fruit (F) is dominant to fasciated

Question

Two genes in tomatoes are 61 mu apart: normal fruit (F) is dominant to fasciated fruit (f), and normal numbers of leaves (Lf) is dominant to leafy (If), A true-breeding plant with normal leaves and fruit was crossed to a leafy plant with fasciated fruit. The F 1 offspring were then crossed to leafy plants with fasciated fruit. If this cross produced 600 offspring, what arc the expected numbers of plants in each of the four possible categories, normal leaves, normal fruit, normal leaves, fasciated fruit: leafy, normal fruit: and leafy, fasciated fruit?

Explanation / Answer

The genetic distance (61 mu) between the genes is quite large. So even though the genes are present on the same chromosome they would assort independently. According to the law of independent assortment, an F1 cross would produce 50% parental and 50% recombinant offspring. Therefore, this cross will produce:
150 offspring with normal leaves,
150 offspring with normal fruit;
150 offspring with normal leaves, fasciated fruit;
150 offspring with leafy, normal fruit and leafy, fasciated fruit

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.