Answer:
The <u>genotype </u>is the internal hereditary code that tells which <u>phenotype</u> will be expressed.
<h2>Prezygotic barriers </h2>
Explanation:
Two potential prezygotic barriers that may be contributing to the divergence and speciation of these two populations of flycatchers are behavioral isolation and habitat isolation
- A prezygotic reproductive barrier is a mechanism that prevents fertilization from occurring
- Behavioral isolation means many species perform different mating rituals for reproduction,for example mating calls of both flycatchers may be different
- Habitat isolation is a type of prezygotic barrier in which two species that could interbreed because the species live in different areas,here in this case flycatchers are living on two different islands and hence cannot mate which results into divergence of two different species
Evidence that would indicate that speciation has already occurred within the flycatcher populations is geographic patterns which resulted into allopatric speciation
- Flycatchers are isolated from each other by geographical barriers because they are located on two different islands
- As they are geographically isolated from each other speciation which occurs is allopatric
Answer:
d) alternating sugars and phosphates.
Explanation:
DNA is a molecule which acts as the genetic material of the organisms on Earth. The DNA is made of the monomer units called nucleotides which are composed of a sugar called deoxyribose, a phosphate group and two types of nitrogenous bases (purines and pyrimidines).
The DNA structure is known as the double-helical model which gives a ladder-like appearance in a twisted manner. The backbone of the ladder or DNA is made of the deoxyribose sugar and the phosphate group whereas the nitrogenous bases are arranged inside the DNA.
Thus, option-D is the correct answer.
