Using T and t as the alleles, what is the dwarf plant's genotype? How could you learn the tall plant's genotype? this is really difficult for me
2007-03-23 13:17:01 · 5 answers · asked by lilbutterfly555 1 in Science & Mathematics ➔ Biology
"Janies Ti..." is correct.
By definition, a recessive trait is only expressed when the 2 recessive genes are present. Thus, the dwarf plant has to be of "tt" genotype. The tall pea plant would have to harbor at least the dominant "T" allele, but could be either "TT" or "Tt" genotypically.
If one were to cross breed these 2 plants ("tt" x "T?"), then you could definitely find out whether the tall plant has a genotype of "Tt" ... on the average, 50% of the offspring would be dwarf phenotypically if the tall plant is "Tt".
The possible genotypes resulting from a "tt" (dwarf) and "Tt" (tall) pea plant are "Tt", "Tt", "tt" and "tt" (these plants are, respectively, tall, tall, dwarf and dwarf phenotypically).
If all of the offspring plants are tall, then the likelihood that the genotype of the tall parent would be "TT" is great, depending on how many offspring are produced ... the higher the number of offspring produced, the more confident one could be that the tall parent is "TT" genotypically.
2007-03-23 17:04:04 · answer #1 · answered by sandorgr8 2 · 2⤊ 0⤋
The dwarf plant's genotype has to be tt, because dwarfism is recessive, and if it were Tt, then the tall allele will be the one that is expressed.
You could determine the tall plant's genotype by breeding it with the dwarf plant or looking at the plant's parents. If the tall plant and the dwarf plant were breeded and produced a dwarf plant, then you would know that the genotype of the tall plant was Tt, because the only possible combination of a TT plant and a tt plant is a Tt plant, which would be tall. You would also know that the tall plant was Tt if one of its parents was a dwarf plant because it would have to get one t allele from the dwarf parent because the dwarf parent only has t alleles. You would have a hard time guaranteeing that the plant was TT because it is possible for a Tt to have two tall parents (a Tt and a TT or a Tt and a Tt), and it is also possible for a Tt breeded with a tt to have only tall children (although it's likely that they would have at least one dwarf child).
2007-03-23 13:31:02 · answer #2 · answered by JaniesTiredShoes 3 · 2⤊ 0⤋
dwarf plant's genotype= tt
tall plant's genotype= either TT, or Tt
remember that dominant trait always use capital letters,either 2 capital letters or 1 capital letter and 1 small letter, while recessive trait use 2 small letters...
2007-03-23 17:00:53 · answer #3 · answered by Juan C 6 · 0⤊ 1⤋
tt Has to be homozygous recessive, as if the genotype contained one T, the plant would be tall. The tall plant is either, Tt or TT. Heterozygous or homozygous dominant.
2007-03-23 13:28:54 · answer #4 · answered by Anonymous · 1⤊ 0⤋
on account that t gets ruled via T, the dwarf plant might desire to haven't any T, so that is tt. to renowned the genotype of the large plant, breed it with the small one. If all offspring are tall, then the genotype of the large plant is TT. If not, then that is Tt.
2016-10-19 11:28:44 · answer #5 · answered by ? 4 · 0⤊ 0⤋