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2 years ago

How specifies that are separated for a river, rocks, mountains, forest ; can at some point not being able to interbreed anymore

Biology

1 answer:

Allushta [10]2 years ago

8 0

Answer:

Species separated by a physical barrier for a long time, suffer allopatric speciation, so they can not interbreed anymore.

Explanation:

Allopatric speciation consists of the geographic separation of a continuous genetic background giving place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flow, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.

Vicariance is the geographical separation of an original population into two or more new groups. Discontinuities in the physical environment like rivers, mountains, water, etc., are physical barriers that impede genetic flow between the separated groups.

The process of allopatric speciation involves different steps:

The emergence of the barrier.
Interruption in the genetic interchange
The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.
Prezigotic isolation mechanisms favored by selection once occurs a secondary contact between the new species in formation.

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This type of membrane transport moves substances against the concentration gradient from an area of low concentration to an area

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Answer:- Active transport

Explanation:-

There are two types of membrane transports

1. Passive transport - this type of transport occurs without the input of any energy and the molecules move along the concentration gradients that is from high concetration to low concentration.

2. Active transport- this type of transport takes place to move the molecules against the concentration gradient that is from low concentration to high concentration.

The active transport is of two types:

1. Primary active transport- in this type of transport ATP is used as an energy source to move the substances against the concentration gradient.

2.Secondary active transport - in this type of transport the gradient formed by the active transport is utilized and it involves the movement of 2 substances at a time aross the membrane. That is the movement of one molecule is coupled to another.

The membrane proteins that are associated with active transport are called as carrier proteins. These proteins have a binding site for the molecules that they transport. Once they bind to the specific molecules, a conformation change is induced and this leads to the transport of the molecule across the membrane.

So, the active transport is basically responsible for utilizing the energy from ATP and carrier proteins to move the substances across the membrane against their concentration gradient i.e. from low concentration to high concentration.

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2 years ago

Which is produced immediately after a plant sperm cell fertilizes an egg cell?

Katyanochek1 [597]

A zygote is immediately formed after fertilization between two gametes. This cell is eukaryotic and made up of a combination of the DNA in both gamete. Zygote contains all the hereditary information essential in the formation of a new individual.

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2 years ago

Which is an important difference between light-dependent (L-D) and light-independent (L-IND) reactions in photosynthesis? The L-

Yuliya22 [10]

Answer;

The L-D reactions require light energy and water, and the L-IND reactions require ATP, NADPH and CO2.

Explanation;

-Photosynthesis is the process by which green plants use light energy from the sun, water and carbon dioxide to make organic molecules, such as simple sugars.

-The process takes place in two phases; light dependent stage and light independent stage.

-During light dependent stage light energy is used to break down water molecules into hydrogen ions and oxygen atoms.

-Light independent reactions uses CO2 and the ATP and NADPH from light dependent reactions to produce sugar/ glucose. ATP is used to provide the energy for sugar synthesis and NADPH is used for electrons in the reduction of Carbon Dioxide into sugar.

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2 years ago

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Which muscle originates on the lateral epicondyle of the humerus and inserts on the olecranon process and superior portion of th

eduard

Answer: Anconeus muscle

Explanation:

The anconeus is a small muscle found at the elbow. It is Attached to the humerus and ulna (it originates on the lateral epicondyle of the humerus and inserts on the olecranon process and superior portion of the ulna). Anconeus muscle allows the forearm to extend and it also provides support for the dorsal joint capsule and the ulna as well.

The radial nerve permits the anconeus muscle to carry all of those functions.

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3 years ago

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emmainna [20.7K]

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