Question

(d) Predict the most likely cause of the F2 ratio obtained by the students in the second analysis between parental flies that are true-breeding for gray bodies and long wings and flies that are true-breeding for ebony bodies and curly wings. Provide reasoning to justify your prediction

Answer 1

Based on ransom crossing, the genotypic and phenotypic ratio of offspring depends on whether each trait is dominant or recessive.

What determines the phenotype of offspring in a cross between parents?

The phenotype of the offspring or filial generation of a cross is determined by the genotype of the parents and the nature of the allele of the genes in the parents, whether they are recessive or dominant.

When two true-breeding species of organisms are crossed, the phenotype of the offspring will be determined by the dominant trait.

For examples, if parental flies that are true-breeding for gray bodies and long wings and flies that are true-breeding for ebony bodies and curly wings are crosed, the genotypic ratio and the phenotypic ratio will be as follows:

GGLL × ggll = GgLl, GgLl, GgLl, GgLl

• Phenotypic ratio = 1
• Genotypic ratio = 1

Where:

• G = gray body is dominant
• g = ebony body is recessive
• L = long wings is dominant
• l = curly wings is recessive

Therefore, the genotypic and phenotypic ratio of offspring depends on whether each trait is dominant or recessive.

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