"Dominance is not an autonomous feature of a gene or product that it has information for it depends as much on the gene product and the production of a particular phenotype from this product as it does on the particular phenotype that we choose to examine in case more than one phenotype is influenced by the same gene " please explain these lines I am asking this for time but the answers are not satisfactory please help experts...
Dear student.
To understand this let us take an example.
The starch synthesis in pea plants is controlled by a single gene. It has two alleles B and b. BB homozygotes produced large starch grains as compared to that produced by bb homozygotes.After maturation, it was observed that BB seeds were round and bb were wrinkled. When they were crossed the resultant progeny were intermediate-sized Bb seeds.
The cross involved is a deviation from Mendel's law of dominance: If starch grain size is considered as the phenotype, then from this angle, the alleles show incomplete dominance. Thus, dominance is not an autonomous feature of a gene, it depends on gene product and production of particular phenotype from this product.
Regards.
To understand this let us take an example.
The starch synthesis in pea plants is controlled by a single gene. It has two alleles B and b. BB homozygotes produced large starch grains as compared to that produced by bb homozygotes.After maturation, it was observed that BB seeds were round and bb were wrinkled. When they were crossed the resultant progeny were intermediate-sized Bb seeds.
The cross involved is a deviation from Mendel's law of dominance: If starch grain size is considered as the phenotype, then from this angle, the alleles show incomplete dominance. Thus, dominance is not an autonomous feature of a gene, it depends on gene product and production of particular phenotype from this product.
Regards.