Question

In a species of plants, flower petal colour is determined by one gene. Red colour is...

In a species of plants, flower petal colour is determined by one gene. Red colour is not dominant to white colour and a cross between a TRUE red and a TRUE white variety yields an F1 that is red with white patches (i.e., F1 is both red and white)?

Genotype of TRUE red variety is:…… ………………… (1 mark)

Genotype of TRUE white variety is:……… …………….. (1 mark)

Genotype of F1 is:………… ………………. (1 mark)

This phenomenon refers to… ……………(1 mark)

Provide a genetic explanation for the above results .

Provide a genetic and biochemical explanation (draw diagram; 5 marks) for the above results.

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Answer #1

Genotype of true red variety is RR

Genotype of true white variety is rr

The F1 generation having both red and white colour having a genotype of Rr

The phenomenon is incomplete dominance.

It is a form of intermediate inheritance where one allele for a specific trait is not completely expressed over its paired allele. It results, a third phenotype that expres physical trait of combination of the phenotypes of both alleles.

It is seen in snapdragon, where red x white (RR×rr) results

RR-red rr-white Rr-pink. The pink shows incomplete dominance.

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