How does crossing 2 true-breeding individuals show which version of the trait is dominant?

Expert Solution

True breeding refers to the plants which are used as parents by Mendel in his genetics experiments and the plants were homozygous for the trait he was experimenting at that moment. Dominant trait refers to the expressed unit factor in the cross whereas the Recessive trait refers to latent unit factor.

In the monohybrid cross shown below in the image, In the Parental (P) generation, Mendel did cross between yellow pods and green pods. Yellow was dominant having YY as two dominant alleles. Green was recessive having yy as two recessive alleles. Each homozygous parent in the P generation produces only one kind of gamete.

Upon self crossing of one of the Yy heterozygous offspring, in the F1 generation, it produces two kinds of gametes Y and y.

Self-pollination of the F1 offspring produces F2 offspring out of which 3 were yellow and one was green. This was phenotypic ratio and the genotypic ratio was 1 (YY): 2(Yy):1(yy) which shows that yellow is the dominant trait.

So by doing self polination of F1 offsprings , we can get to know that which of the trait is the dominant trait.

gladiator answered 17 hours ago

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