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Oksi-84 [34.3K]
3 years ago
15

What stage in meiosis does crossing over occur?

Biology
2 answers:
kipiarov [429]3 years ago
7 0
It occurs during The prophase stage
Delicious77 [7]3 years ago
6 0
It occurs during the prophase stage
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Each of the following relates to an aspect of evolution by natural selection. Explain the following. ii. Natural selection and t
dlinn [17]

         The first one, ii. Natural selection and the formation of inseticide resistant insects or antibiotic resistant bacteria.

          This can be explained in very simple way. As we all know, natural selection works in a way that only that adapted living beings are going to survive through a specific environment, whether it's because they can grab their food without too much work, or even that they can adapt to the weather. When we use inseticide, we are killing lots of non-resistant insects, and what's left are those that are resistant to this inseticide, and they'll reproduce again, and again we'll go through the same process, but remember, this insect is now stronger and more resistant that before.

            The second case, iii. speciation and isolation give three examples how it may occur.

            Well. the allopatric speciation and isolation will happen when theres a geographic barrier between one species. This one then is divided into two diffent habitats, but what can divide than could be a mountain, a tree, a river, a rock, anything. And this could be too called as a geographic isolation, because in this new environment, species are going to develop in a different way.

4 0
3 years ago
What is anabolism? Give an example. What is catabolism also give an example
Oksana_A [137]

Answer:

Anabolism is the synthesis of complex molecules in living organisms from simpler ones together with the storage of energy.

Examples of anabolism: bone growth and mineralization, and muscle mass build-up.

Catabolism: the breakdown of complex molecules in living organisms to form simpler ones, together with the release of energy.

Examples of Catabolism: glycolysis, the citric acid cycle, the breakdown of muscle protein in order to use amino acids as substrates for gluconeogenesis, the breakdown of fat in adipose tissue to fatty acids, and oxidative deamination of neurotransmitters by monoamine oxidase.

7 0
3 years ago
The ability of vibrio cholerae to cause disease depends on a number of factors. What are general requirements for any organism t
Svetllana [295]
<h2>Disease </h2>

Explanation:

  • Pathogenicity is the ability to produce disease in a host organism
  • Microbes express their pathogenicity by means of their virulence, a term which refers to the degree of pathogenicity of the microbe
  • The relationship between a host and a pathogen is dynamic, since each modifies the activities and functions of the other
  • The outcome of such a relationship depends on the virulence of the pathogen and the relative degree of resistance or susceptibility of the host, due mainly to the effectiveness of the host defense mechanisms
  • Hence, general requirements for any organism to cause disease within a host are: evasion of host defenses , gaining access to the host via a portal of entry, adherence to host tissues

 

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3 years ago
What is the sympathetic nervous system and what are some of the effects it has on the body?
Alex Ar [27]
Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the heart rate.
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2 years ago
Which of the following scientists contributed to the current understanding of<br> genetics?
tresset_1 [31]

Answer:

sir issac newton.

Explanation:

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3 years ago
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