Question

What is the phenotypic ratio and

Genotypic ratio of miniatures cross?​

Answer 1

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In nature, some fruit fly traits like those described above assort independently, whereas others do not. As an example, consider the relationship between fruit fly body color and wing length. Here, the gene for wing length is represented by two alleles, V and v; the V allele codes for long wings, which is the dominant phenotype, and the v allele codes for short, misshapen wings (called vestigial wings), which is the recessive phenotype.

In order to observe the inheritance pattern associated with fruit fly body color and wing length, a test cross between a BbVv fly and a bbvv fly can be performed. The results of this cross, however, will not follow the classic 1:1:1:1 phenotypic ratio expected with independent assortment. Instead, the offspring of this particular cross will be present in a 5:1:1:5 ratio (5 brown body with long wings: 1 brown body with vestigial wings: 1 black body with long wings: 5 black body with vestigial wings). These results indicate that there is a bias toward brown body color and normal wings being inherited together (BV), as well as toward black body color and vestigial wings being inherited together (bv), from the parent with the BbVv genotype (Figure 4). Note that the parent with the bbvv genotype can only contribute bv alleles.

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Answer 2

The phenotypic ratio is 3:1 and the Genotypic ratio is 1:2:1

Explanation:

• Phenotypic ratio concerns the corresponding number of offspring showing a special trait or mixture of traits. It can be decided by doing a test cross and knowing the frequency of a trait or trait orders that will be revealed based on the genotypes of the offspring.
• The genotype is the hereditary make-up of a bion. It defines the characteristics of each allele.
• Also, it is not important that the Phenotypic ratio is invariably different from Genotypic ratio. We contemplate their studies in Non-Mendelian Inheritance, models of which are

1. Incomplete dominance
2. Codominance.

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