Question

In Lathyrus odoratus, hybrid blue flowered and long pollen plant is test crossed with homozygous recessive red-flowered and round pollen plant then how many parental types are obtained when genes are present in a cis stage in parents?

• A. 50 %
• B. 43.7 %
• C. 87. 4 %
• D. 12.6 %

Answer 1

The correct option is C 87. 4 %

In Lathyrus odoratus, the blue flower (B) is dominant red flower (b) and long pollen (L) is dominant over round pollen. A cross is made between blue flowered and long pollen (BbLl) plant and red flower and round pollen plant (bbll). In this case, the alleles do not assort independently. Hence, it shows greater frequency of 87.4% of parent types, that is Round-blue and long-red and less frequency of 12.6% of recombinant types, that is Long-blue and Round-red.

Thus, the correct answer is '87.4%.'