if one of the plants used in the F1 cross had TT alleles and was combined with a plant with Tt alleles, would the trait controlled by the recessive allele have been produced in the resulting F2 generation?explain your answer.
2007-02-26 15:58:53 · 3 answers · asked by fillojeta a 1 in Science & Mathematics ➔ Biology
assuming complete dominance, no.
Genotypes of the offspring would be either TT or Tt so the recessive phenotype would not be visible.
2007-02-26 16:09:09 · answer #1 · answered by audionaut 3 · 0⤊ 0⤋
No it won't:
Lets say plant A has TT genotype. Its gamete will all have T,
Now, plant B has Tt genotype. Its gametes will either have T or t.
When crossing these to plants, the seeds will have either TT (one T from each parent) or Tt (T from plant A and t from plant B). The seeds with TT will have the characteristics of dominant allele: T.
The seeds with Tt will show the characteristics of dominant allele but they will be carriers of the characteristics of recessive allele: t.
2007-02-27 00:13:25 · answer #2 · answered by smarties 6 · 0⤊ 0⤋
here's your punnet square:
F1~~~~~TTxTt
~T T
T|TT|TT|
t|Tt | Tt |
F2: depends on what you cross it with. the recessive alleles will show up if there is no dominant allele present to hide it.
2007-02-27 00:31:19 · answer #3 · answered by ♪寿司人♫ 3 · 0⤊ 0⤋