The word genotypes is in reference to the alleles an individual receives at fertilization. Lets say that the allele/gene/trait, genotype for the Tall plant is T and dominate and the allele/gene/trait genotype for the short plant is t and recessive. If the genotype is an homozygous allele/gene/trait has two dominate alleles/genes/traits seen as two capital letters ex: dominate tall=TT or if the genotype is homozygous with two recessive alleles/genes/traits it will have two lower case letters ex: short=tt. If the genotype is heterozygous is a Tall plant that means the allele/gene/trait will have one dominate T=Tall and one recessive t=short and it will look like this Tt and with this genotype a Tall plant will be produce "T", even though that plant will still carry an allele/gene/trait for shortness "t". Tips: homozygous [Gk.homo means same and zygous means balance] & heterozygous [Gk.hetero means different and zygous means balance]
If we see a white guinea pig, it's genotype must be "bb". If you look at a pea plant & it is short, its genotype must be "tt". You bump into a two-eyed purple people eater on your way to the mall, its genotype for eyes is "ee", because we all know that in purple people eaters the dominant trait is one eye (EE or Ee).
The genotype is heterzygous, meaning that there are two different alleles. If you want to use letters to represent the tall and short alleles, you could use T for tall (capital letter indicates a dominant allele), and t for short (lowercase letter indicates a recessive allele). So the heterozygous genotype for a tall pea plant could be indicated by Tt.
Tall is a dominant trait.
So homozygous for tall is TT and heterozyous for tall is Tt. Both plants are phenotypically tall.
Considering that tallness is the dominant trait, the genotype of a heterozygous tall pea plant is Tt.
TT homozygous tall pea plant
Tt heterozygous tall pea plant
homozygous- TT; heterozygous- Tt :)
Tt
Heterozygous
DD is homozygous dominant is a genotype which gives tall plant.
Homozygous dominant would be all Capital letters. Homozygous recessive would be all lower case letters. So...in basic color genetics for horses: A homozygous recessive horse would be aaee A homozygous dominant horse would be AAEE
For example, if the tall plant stand for T, the genotypes are: TT tt
If a heterozygous tall pea plant, Aa, is crossed with a homozygous plant, AA, for the trait, you will have a one in one in four chance of the offspring being heterozygous. You will need to create a square and plug the traits in to see what the odds are.
homozygous- TT; heterozygous- Tt :)
Heterozygous
The second allele. If a plant is heterozygous tall, it is Tt. In this case, the dominant trait is tall, T and recessive is short, t. There are two options for it to be dominant, heterozygous (Tt) or homozygous (TT)
DD is homozygous dominant is a genotype which gives tall plant.
Homozygous dominant would be all Capital letters. Homozygous recessive would be all lower case letters. So...in basic color genetics for horses: A homozygous recessive horse would be aaee A homozygous dominant horse would be AAEE
there is a 50% chance that the offspring will be tall.
For example, if the tall plant stand for T, the genotypes are: TT tt
If a heterozygous tall pea plant, Aa, is crossed with a homozygous plant, AA, for the trait, you will have a one in one in four chance of the offspring being heterozygous. You will need to create a square and plug the traits in to see what the odds are.
Presuming tall is a dominant allele (the 2nd parent is heterozygous and "tall" is it's phenotype), then the square would be as follows: Let T be the dominant gene for tall, and thus every genotype containing this (TT, or Tt) would produce a tall plant. Let t be recessive, and in the absence of T (tt) causes a plant to be small. So the homozygous tall parent would be TT, and the heterozygous tall parent would be Tt. So now you just have to cross them. During meiosis, every gamete from the TT genotype would contain a T allele. However, for the Tt genotype, there is equal chance each gamete will contain EITHER a T or a t. So the square would be: xxTxxT TxTTxTT txTtxTt As you can see, 2 out of the 4 offspring have a Tt genotype (heterozygous), so this translates to a 1/2 fraction, or 50%. Ignore the Xs in the table- if i just used spaces then all the letters crunched up on top of each other when i pressed save...it was the best i could do...:S
I assume you mean heterozygous dominant tall and short is recessive.T = tall.t = shortTt X tt (called a test cross )1/2 Tt-----------------------heterozygous dominant1/2 tt-----------------homozygous recessive
In such a cross, the F1 plants will always be tall, because that is the dominant allele. In the cross described, a homozygous dominant plant was crossed with a homozygous recessive plant; a cross that produces 100% heterozygous offspring. (AaBbCc)
You get one homozygous dominant (TT), one homozygous recessive (tt), and two heterozygous (Tt).