Question:
Polyembrony is controlled by?
Polyembrony is controlled by?
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Remember that in citrus, polyembryony is a dominant trait, while monoembryony is recessive.
This means crossing two monoembryonic parents will only produce monoembryonic offspring, whereas a polyembryonic parent can pass the trait directly to its hybrids.
This means crossing two monoembryonic parents will only produce monoembryonic offspring, whereas a polyembryonic parent can pass the trait directly to its hybrids.
Updated On: Jul 23, 2026
- Dominant gene
- Recessive gene
- Single pair of gene
- Self sterility
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Polyembryony is the biological phenomenon where two or more embryos develop from a single fertilized egg or within a single seed.
In horticultural crops, particularly in the genus Citrus and mango (*Mangifera indica*), polyembryony is a key trait that allows for the production of clonal, nucellar seedlings.
Step 2: Detailed Explanation:
Let us examine the genetic control of polyembryony:
In *Citrus*, polyembryony is primarily nucellar in origin, meaning that somatic cells of the nucellus develop into maternal embryos alongside the sexual zygotic embryo.
Genetic inheritance studies show that the presence of nucellar embryony (polyembryony) is controlled by one or more dominant genes.
When a cross is made between a monoembryonic female parent (homozygous recessive) and a polyembryonic male parent, the trait is expressed in the $F_1$ generation according to dominant inheritance patterns.
This dominant nature makes it a highly heritable trait, allowing breeders to introduce or eliminate polyembryony systematically in breeding lines.
Step 3: Final Answer:
Polyembryony in citrus is controlled by a dominant gene.
This corresponds to Option (A).
Polyembryony is the biological phenomenon where two or more embryos develop from a single fertilized egg or within a single seed.
In horticultural crops, particularly in the genus Citrus and mango (*Mangifera indica*), polyembryony is a key trait that allows for the production of clonal, nucellar seedlings.
Step 2: Detailed Explanation:
Let us examine the genetic control of polyembryony:
In *Citrus*, polyembryony is primarily nucellar in origin, meaning that somatic cells of the nucellus develop into maternal embryos alongside the sexual zygotic embryo.
Genetic inheritance studies show that the presence of nucellar embryony (polyembryony) is controlled by one or more dominant genes.
When a cross is made between a monoembryonic female parent (homozygous recessive) and a polyembryonic male parent, the trait is expressed in the $F_1$ generation according to dominant inheritance patterns.
This dominant nature makes it a highly heritable trait, allowing breeders to introduce or eliminate polyembryony systematically in breeding lines.
Step 3: Final Answer:
Polyembryony in citrus is controlled by a dominant gene.
This corresponds to Option (A).
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