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(A) Complementary genes are two or more independent genes that interact to produce a specific phenotype,which neither can produce alone. For example,i

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Complementary genes

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(A) Complementary genes are two or more independent genes that interact to produce a specific phenotype,which neither can produce alone. For example,in Lathyrus odoratus (sweet pea),the production of purple flower color requires the presence of two dominant genes,$C$ and $P$. If either gene is present in the homozygous recessive state (e.g.,$ccP-$ or $C-pp$),the flower color remains white. Thus,these genes complement each other to express the trait.

When two independently assorting dominant genes interact with each other to produce a specific phenotype,but cannot produce that phenotype when present alone,such genes are called .....

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