Question

T=tall and t=short. if you have a tall plant, how can you tell if it is TT or Tt

Answer 1

you'd have to perform a test cross, which involves cross-pollinating the plant in question with a plant that has a homozygous recessive genotype (tt). Then you look at the ratios of offspring.

TT x tt yields all Tt, which would show the dominant phenotype.
Tt x tt yields half of the offspring Tt and half tt, so half are tall and half are short.

Answer 2

This is assuming that there is complete dominance of T over t.

Answer 3

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Answer 4

Let's try to picturize what @aaronq said.

Answer 5

Suppose if you have a tall plant whose genotype is unknown to u and you want to investigate its genotype.

Answer 6

Now what u'll basically do is u perform a cross between the unknown plant and a plant whose genotype is `tt` known to you.

Answer 7

If u get all tall plants as result then it will confirm that the genotype of unknown plant is TT and if u also get some short plants then it idicates that the genotype of unknown plant is Tt