How do two organisms have the same phoenotype but different genotypes?

Answer 1

Phenotype is what it looks like physically (both begin w/ "P")
Genotype is what it is genetically... (Both begin w/ "G")

So, if the trait is an either/ or trait-- where you can be this OR that... then the phenotype could appear the same, but the genotype would be different.

I wouldn't look at eye color b/c several genes determine that-- lets look at something that only 1 gene can determine.

For example: People either have a widows peak or not (a widows peak is when the hair line on the forehead comes to a point-- like Eddie Munster). This is a dominate trait and therefore can appear if the genotype is Homozygous Dominate (HH) or Heterozygous (Hh).. the only way one would not have it is if they are Homozygous Recessive (hh).
HH= has Widows Peak
Hh= has Widows Peak
hh= does not have Widows Peak

Example 2:
Among a certain type of flower you can have either Red or White and lets say Red is dominate... Well, the only way to get White would be to have a genotype that is Homozygous recessive.
Therefore:
RR= Red flower
Rr= Red flower
rr= white flower

So this only happens if the trait is an "either/ or" type of trait... w/ example 2, if there was an intermediate, say the Heterozygous could be Pink--- you would have 3 different phenotypes, one for each genotype. So it only works if there can only be 2 phenotypes.

Answer 2

To the 1st question; definite, you are able to have an organism with a similar genotype and diverse phenotype. as an occasion; take twins and feed one ok, on a similar time as feeding the different no longer so properly. The properly fed twin will respond to his genotype potential, say for top. the different would be of stunted boost. remember, the phenotype is composed of the genotype and the ambience. the 2d question does no longer sound a threat, as unique environments might selection.

Answer 3

You have to understand the definition of the words. Phenotype means morphological features, by and large. Genotype means the state of the genes. For example, it's common in genetics of diploid organisms to show that a mutation is either dominant or recessive. Recessive mutants require both copies of the gene to have the mutant, while the dominant mutants only require one copy.

For example, lets take Mendel's peas. Say there are two phenotypes related to a genotype; green peas or yellow peas. Say that GG is green peas and gg is yellow peas. Say the genetics show that yellow peas are recessive to green, meaning that both copies of the gene must be mutant. So, if you cross a true-breeding yellow and true breeding green, you'll get green progeny (this generation is called F1), and all individuals will be heterozygous for the gene. Now, if you intercross the F1 (to get the F2 generation), the offspring will be GG, Gg, and gg in a 1:2:1 ratio. GG and Gg will both be green, thus having one phenotype related to multiple genotypes.

In reality, the situation is somewhat complex (as most things are), but if build back the model from genes to phenotype, you'll see that protein expression and enzymatic activites play a role in expressing a genotype, and often many different mutants will give the same phenotype. For instance, if there is a biochemical pathway in that the genes A, B, and C are all involved, mutation of any one of them results in a disrupted pathway. This is most easily seen in haploid organisms such as bacteria and yeast, since gene copy doesn't enter the picture, but you could imagine a series of dominant mutations in diploid organisms doing the same thing. In essence, this is why haploid organisms are better for genetics than diploids; mutation of the gene directly leads to a phenotype, whereas in diploids you need to consider ploidy (gene copy #)

Answer 4

I'll answer this with an example. Suppose you have type A blood. A type blood can occur with either two copies of the gene (one from each parent) or from one copy of the A gene and one copy of the O gene (one from each parent). Both genotypes will have the same phenotype: A type blood. But the genotypes are AA and AO. This answer assumes you know a bit about genetics.

Answer 5

Yes, the easiest example to give would be two individuals with brown eyes. Simply put, brown eyes is a dominant phenotype so those that are heterozygous and homozygous for brown eyes would both phenotypically express the brown eye trait. However, the reccesive allele would only be present in the heterozygous individual.