Question, based of previous question if we set up a monohybrid selfing (Tt X Tt)

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Question, based of previous question if we set up a monohybrid selfing (Tt X Tt), what fraction of the tall offspring will have the genotype Tt? Question, based of previous question if we set up a monohybrid selfing (Tt X Tt), what fraction of the tall offspring will have the genotype Tt?

Previous Question. If we set up a cross as depicted in Fig. 3.6 and obtain both tall and short plants. Among the tall plants, what fraction of the tall offspring (F1 in Fig. 3.6) will have the genotype Tt?

P generation Tall Short Tt Gametes ?? ?? Fertilization F1 generation Tall Tall Short Short Conclusion: Genotypic ratio 1 Tt:1 tt Phenotypic ratio 1 tall: 1 short Figure 3.6 Genetics Essentials:Concepts and Connections, First Edition 2010 W. H. Freeman and Company

Explanation / Answer

In a monohybrid selfing (Tt*Tt) means Heterozygous tall plants are self pollinated.

Gametes T t T t

mono hybrid cross using punette square

Rresulting ratio of phenotype Tall :short would be 3:1

ou of the 3 tall plants the no of plants with Tt genotype will be 2.

so the fraction of tall offspring that will have genotype Tt will be 2/3.

T t T TT Tt t Tt tt

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