Describe evidence from biogeography that species evolve adaptations to their environment

Biology

1 answer:

Romashka [77]1 year ago

7 0

Answer:

Biogeography, the study of the geographical distribution of organisms, provides information about how and when species may have evolved. Fossils provide evidence of long-term evolutionary changes, documenting the past existence of species that are now extinct.

To give one classic example, the forelimbs of whales, humans, and birds look quite different on the outside. That's because they're adapted to function in different environments. However, if you look at the bone structure of the forelimbs, you'll find that the organization of the bones is remarkably similar across species. It's unlikely that such similar structures would have evolved independently in each species, and more likely that the basic layout of bones was already present in a common ancestor of whales, humans, and birds.

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In Drosophila, a developmental mutation called ssa (spineless aristapedia) results in flies with mini leg parts on the antennae.

34kurt

Given our understanding of genetics, we can confirm that the gene in question is of the homeotic type.

In biology, we refer to a gene as the most basic unit of genetic information.
It is a segment of DNA that encodes for a certain trait that <u>may or may not be expressed.</u>
A gene carries the information for a specific trait, for example:

1) Eye color

2) Body organization

3) Height

<h3 /><h3 /><h3>What does it mean for a gene to be homeotic?</h3>

In the case of this question, the gene in question is a homeotic gene.
Homeotic genes are those that are in charge of the organization of the organism's body.
These genes control the <u>general pattern of the body</u>, such as where the arms and legs will be, and so on.

Therefore, given the definition of a homeotic gene, we can confirm that this is the type that best fits the description of the mutation in the question since it affected the formation and normal organization of the body.

To learn more about homeotic genes visit:

brainly.com/question/7991651?referrer=searchResults

4 0

1 year ago

Plz help me ASAP! Thank you

Ad libitum [116K]

Answer:

According to the diagram, cell growth and preparation occur in steps 2 and 4, corresponding to phases G₁ and G₂ of cell cycle.

Explanation:

G₁ phase consists of the beginning of the cell cycle, following the process of previous division, and occurs in a cell that prepares for a next division. In this phase growth depends on the proliferation of mRNA to increase protein synthesis.

G₂ phase —third phase of the cycle— is the continuation of the process of cell growth induced by protein synthesis. Changes occur at the level of cellular components, as preparation of the cell prior to division.