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  • A sweet pea plant with heterozygous genotype AaBb is test crossed. If the two genes interact in complementary manner, what would be the phenotypic segregation w.r.t flower colour ?  </p

A sweet pea plant with heterozygous genotype AaBb is test crossed. If the two genes interact in complementary manner, what would be the phenotypic segregation w.r.t flower colour ?
 

Option: 1

3 Purple : 1 White


Option: 2

1 Purple : 3 White


Option: 3

1 Purple : 1 White 

 


Option: 4

9 Purple : 7 White


Answers (1)

best_answer

If the two genes in a sweet pea plant interact in a complementary manner, the phenotypic segregation with respect to flower colour would be: 1 Purple : 1 White.

In a complementary gene interaction, both genes must have at least one dominant allele for the expression of the dominant phenotype. The presence of the dominant allele at either gene locus is sufficient to produce the dominant phenotype. Therefore, in the test cross of a heterozygous plant (AaBb), half of the offspring will have the dominant phenotype (purple) and the other half will have the recessive phenotype (white). This results in a 1:1 segregation ratio of purple to white flowers. Hence, the correct answer is option 3. 

Posted by

Sanket Gandhi

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