The Crossover of chromosomes occurs during the prophase 1 phase of meiosis.
<h2>Further Explanation
</h2><h3>Cell division </h3>
- Cell division is the process in which cells within an organism undergoes division to give rise to new cells.
- There are two types of cell division, namely:
<h3>Mitosis </h3>
- Mitosis is a type of cell division that occurs in the somatic cells or the body cells where cells divides to give new cells that are similar to the parent cell.
- The daughter cells have the same number of chromosomes as the parent cells.
- For example in humans the parent cells are diploid, 2n, while the daughter cells are also diploid, 2n. (Diploid means each cell has two pairs of chromosomes).
<h3>Meiosis </h3>
- This is a type of cell division that takes place in the gonads, or reproductive organs, in which cells divide to form daughter cells that differ genetically with the parent cells.
- The daughter cells contain half the number of chromosomes, haploid, n, while the parent contain a diploid number, 2n, of the chromosomes.
- Meiosis occurs in two phases, that is, meiosis I and meiosis II
- During the process of meiosis several processes occurs that cause genetic variation among organisms. These processes include, crossing over, independent assortment of genes, among others.
<h3>Crossing over </h3>
- Cross over is the process that occurs during the prophase I phase of the first stage of meiosis known as meiosis I.
- During the process of crossing over, genetic material is exchanged between homologous chromosomes which enhances the genetic variation in organisms.
Keywords: Cell division, meiosis, mitosis, prophase I, crossing over
<h3>Learn more about:
</h3>
Level: High school
Subject: Biology
Chapter: Cell division
Sub-topic: Meiosis
Answer:
bacteria pathogens caused most of the pandemics
Answer: The correct answer is Parrot and Dog.
The animals which can maintain their body temperature by generating internal heat are called as warm-blooded animals or endotherms. They maintain constant temperature irrespective of the temperature in their surrounding.
These animals mainly include birds and mammals.
On the contrary, the cold-blooded animals ( ectotherms) are those, which absorb heat from surrounding and do not generate much of the internal heat. Their temperature fluctuates as the surrounding temperature changes. These animals include reptiles, amphibians, fishes, and invertebrates.
Thus, the correct answer is parrot ( bird) and Dog( mammal)
According to the research, risk assessment is a tool that helps us create cost-effective ways to protect our health and the environment.
<h3>What is risk assessment?</h3>
It is the process aimed at estimating the magnitude of the risks that could not be avoided, that is, it seeks to identify and eliminate risks present in the environment.
It allows you to adopt measures and make decisions focused on meeting the objectives established in terms of health and the environment.
Therefore, we can conclude that according to the research, risk assessment is a tool that helps us create cost-effective ways to protect our health and the environment.
Learn more about risk assessment here: brainly.com/question/52038
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The correct answer is carbon dioxide and oxygen