In tomato, genotype aabbcc produces 100 gm tomatoes and genotype AABBCC produces 160 gm tomatoes. What is contribution of each polygene in the production of tomatoes?

To determine the contribution of each polygene in the production of tomatoes, we can use a method called gene dosage. Gene dosage refers to the number of copies of a particular gene or alleles in an individual's genotype.

In this scenario, we have two genotypes: aabbcc and AABBCC, with the former producing 100 grams of tomatoes and the latter producing 160 grams.

To calculate the contribution of each polygene, we need to understand how these genotypes affect the tomato's weight.

Let's start by identifying the alleles involved in determining tomato weight. We'll use capital letters (A, B, and C) for dominant alleles and lowercase letters (a, b, and c) for recessive alleles.

Based on the given information, we can infer that the alleles A, B, and C all contribute to increasing tomato weight, while a, b, and c have a lesser effect or no effect. Therefore, the aabbcc genotype represents the absence of the contributing alleles (recessive form), resulting in a lower tomato weight of 100 grams. On the other hand, the AABBCC genotype contains the contributing alleles (dominant form) and results in a higher tomato weight of 160 grams.

To determine the contribution of each polygene, we need to examine the effect of individual alleles. We can consider each polygene separately and determine the weight increase contributed by each dominant allele.

Since we have three polygenes (A, B, and C), we need to assess the impact of each one individually. We can do this by comparing the weight increase between the recessive genotype (aabbcc) and the dominant genotype (AABBCC).

To isolate the contribution of each gene, we can create intermediate genotypes by fixing the alleles for the other genes. For example, to determine the contribution of gene A, we can make the intermediate genotypes AABBcc and aaBBcc and compare their tomato weights.

By comparing the tomato weights of the intermediate genotypes, we can deduce the contribution of gene A. Let's say AABBcc produces 150 grams and aaBBcc produces 110 grams. This means gene A's contribution is 40 grams (150 grams - 110 grams). We can repeat this process for genes B and C in the same way to find their individual contributions.

Using this approach, we can calculate the individual contributions of each polygene in the production of tomatoes, considering the difference between the recessive and dominant genotypes for each gene.