Question

Why were all plants obtained in F1 generation tall

Answer 1

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Cross breeding T T with t t plants produces T t plants in the first or F1 generation. ... The F1 plants are tall because the T allele is expressed and "cover up" the t allele. So the T (tall) allele is called dominant and t (short) allele is called recessive.

Answer 2

Answer:

cross beeding T T with t t plants produces T t plants in the first or F1 generation..... The F1 plants are tall because the T allele is expressed and cover up the t allele . So the T (tall) allele is called dominant and t (short) is called recessive