The niche of an organism is the functional role that it plays within an ecosystem. The niche (better refined as the 'ecological niche') is determined by the abiotic factors, which comprise of living features such as animals, plants and fungi, and biotic factors.
This is what I found on the internet hope it helps
a herbivore? feeding on plants
Answer:
- If the plant is homozygous, the percentage of purple-flowered progeny is expected to be 100%.
- If the plant is heterozygous, the percentage of purple-flowered progeny is expected to be 50%.
Explanation:
A test-cross is performed between an individual for whom you want to know the genotype (to find out if it is heterozygote or homozygote) and a recessive homozygote individual.
If the first individual is a heterozygote, the progeny phenotypic and genotypic proportions are 50% heterozygote and 50% recessive homozygote. But if the first individual is a homozygote, the whole progeny will be expressing one of the traits.
This is, from the proposed example, we know that:
- The allele for purple flower color is dominant to the allele for white flower color.
- A test-cross was performed to determine the genotype of a purple-flowered plant
We will represent the allele expressing purple color as P, and the allele expressing white color as p.
The purple-flowered plant genotype might be PP or Pp, so the options are:
Gametes) P P p p
Punnet square) P P
p Pp Pp
p Pp Pp
F1 Genotype) 100% Purple-flowered plants. The genotype of the tested individual was homozygote for the purple trait.
Gametes) P p p p
Punnet square) P p
p Pp pp
p Pp pp
F1 Genotype) 50% Purple-flowered plants and 50% white-flowered plants. The genotype of the tested individual was heterozygote for the purple trait.