why did mendel's cross of purebred and short pea plants result in only tall plants?
2006-09-26 06:11:02 · 5 answers · asked by brandy 2 in Science & Mathematics ➔ Biology
I assume a few things here. We are dealing with simplistic Mendelian genetics, and that you are speaking of homozygous tall plants (purebred?) and short pea plants.
If, in this simple hypothetical situation, one group of peas are tall and are known to have the genotype
TT - indicating two autosomal dominant tall genes
And the the other group of peas are short and are known to have the genotype
tt- indicating autosomal recessive short genes
Then.
All of the first generation offspring of the mating between these groups will be Tt. They will all be tall because the tall gene dominates the recessive short gene, t.
The next generation, however, will be mixed. Each individual plant will inherit one gene from each parent, just as the previous generation, but things are more mixed.
25% will be TT and be tall (since T is dominant.)
50% will be Tt and be tall (since T is dominant.)
25% will be tt and be short. (since the recessive gene can now be expressed.
Hope this answers the question that you asked.
2006-09-26 06:24:32 · answer #1 · answered by Nick â? 5 · 6⤊ 0⤋
Well, this would mean that the purebread tall plants have the dominant allele and short is a recessive allele. So, if tall is TT and short is tt, and you combine a pure tall and a pure short TT x tt, all the offspring will be Tt and the dominant trait will be expressed, which is being tall.
2006-09-26 07:03:09 · answer #2 · answered by natureutt78 4 · 0⤊ 0⤋
Because the purebread peas are homogeneous for the TT (tall tall) gene. This shows that the tall gene is dominant, so if you get any Tt (tall, short) they will still be tall. Hope this helps.
2006-09-26 06:14:54 · answer #3 · answered by ohmneo 3 · 1⤊ 0⤋
Pea vegetation may additionally self-fertilize. In different words, one determine can produce offspring by using itself. which could be an exceptionally reachable trait to work out the variety of genes that are in one determine, and in producing organic breeds. It enables additionally that pea vegetation have lots of distinctive characteristics. It does no longer have been a reliable decision in the event that they have been all greater or much less the comparable. final, yet no longer least, he lived in a monestary. maximum monestaries of the time strove to be self-sufficient, so it rather is all yet particular that his monstery ALREADY had important gardens and pea vegetation. No element finding around whilst what you decide on is already precise there!
2016-12-12 15:32:07 · answer #4 · answered by ? 4 · 0⤊ 0⤋
the above answers are correct. but simplified, it was because the tall plant gene was dominant.
2006-09-26 06:28:28 · answer #5 · answered by stephizzal 5 · 1⤊ 0⤋