In tomatoes, red fruit is dominant to yellow fruit. The fruit of hairy stems is

Question

In tomatoes, red fruit is dominant to yellow fruit. The fruit of hairy stems is dominant to hairless stems. Suppose that a true-breeding strain with red fruit and hairless stems is crossed with a true breeding strain that has yellow fruit and hairy stems. The F, generation is then crossed with a true-breeding strain that has yellow fruit and hairless stems. What fraction of the progeny of this test cross are expected to have red fruit and hairy stems? Select one a. 4/16 b. 9/16 c. 3/16 d. 1/16 e. none

Explanation / Answer

Let us first look at the genetics of it or the genetical outfit from where we can solve this problem.

We have tomato plant in hand which have strain with red tomato and hairless stem, this makes R for red tomato dominant trait and h for hairless stem recessive trait.

Now the other plants genotype is yellow fruit and hairy stem. We can consider the yellow here as r, as it is the recessive trait, and the H as dominant hairy stem

Let us fuse them together for the F1 generation R h X r H = RrHh with red fruit and hairy stem.

This will be carried to the F1 X a true-breeding strain of yellow fruit and hairless plant, rrhh would be the genotype for that.

RrHh X rrhh = The punnet square for the generation calculation:

Here we can see from the genotyepe is that only two plant has got the Red colour and hairy phenotypic ratio over 16. None of the given options are matching with the answer thus, as it is 2/16.

Rh rh rH rh Rh RRhh Rrhh RrHh Rrhh rh Rrhh rrhh rrHh rrhh rH RrHh rrHh rrHH rrHh rh Rrhh rrhh rrHh rrhh

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

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