In the F₂ generation of di hybrid cross between yellow, round seeded and green wrinkled seeded pea plants, 17 out of 254 seeds were green and wrinkled. Other seeds were: ☆ Yellow and round ☆ Green and round ☆ Yellow and wrinkled. What do these results indicate?
- The allele for wrinkled is recessive but not the allele for green
- Crossing-over has occurred
- Green and wrinkled are both recessive characters
- The alleles for green and wrinkled are linked
Explanation
Let’s carefully analyze:
In a dihybrid cross (YyRr × YyRr), Mendel’s law predicts a 9:3:3:1 ratio.
Expected proportion of green wrinkled (yyrr) = 1/16.
If total seeds = 254 → expected green wrinkled = 254 ÷ 16 ≈ 15.9 (~16).
Observed = 17, which matches expectation.
👉 This shows that both green (y) and wrinkled (r) are recessive traits.
Related MCQs
ڈپریشن کیا ہے؟
- A physical disease
- A psychological disorder
- A social institution
- A cultural trait
اس سوال کو وضاحت کے ساتھ پڑھیں
ممپس اور خسرہ سے بچاؤ کے لیے استعمال کیا جاتا ہے؟
- Painkillers
- Antibiotics
- Vaccination
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
ہیضہ کی بیماری کس کی وجہ سے ہوتی ہے؟
- Air
- Water
- Soil
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
ڈائنوسار کا تعلق جانوروں کے کس گروہ سے ہے
- Mammals
- Amphibians
- Reptiles
- Birds
اس سوال کو وضاحت کے ساتھ پڑھیں
چٹان کا مطالعہ کیا کہلاتا ہے؟
- Petrology
- Edaphology
- Petrogenesis
- Pedology
اس سوال کو وضاحت کے ساتھ پڑھیں
