Evaluation · Q32
Q.When two different genes came from same parent they tend to remain together.
i) What is the name of this phenomenon?
ii) Draw the cross with suitable example.
iii) Write the observed phenotypic ratio.
Tamil Nadu DgeTextbookSubjectiveImportance★★★★★
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Start your 14-day free trial to unlock the full solution →Step 1. When two different genes inherited from the same parent consistently travel together into the same gamete rather than assorting independently, this is linkage, arising because the two genes sit on the same chromosome.
Step 2. Taking a coupling-phase example with genes P (purple flower) and L (long pollen) linked, p (red) and l (round) linked on the homolog: P generation PL/PL x pl/pl gives F1 heterozygote PL/pl. Testcrossing this F1 to pl/pl gives mostly parental gametes PL and pl, plus a minority of recombinant gametes Pl and pL from crossing over. …
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