<h2>Exchange of Gases in the lungs</h2>
Explanation:
- Gas exchange occurs by process of <u>diffusion.</u>
- Gas exchange occurs in sac like structures called <u> alveoli.</u>
- <u>Oxygen</u> diffuses from the alveolar sacs into the blood in the capillaries.
- <u>Carbon dioxide</u> diffuses from the blood in the capillaries into the alveolar sac .
As blood passes through the lungs, it picks up oxygen and gives up carbon dioxide simply by diffusion down partial pressure gradients between blood and Alveoli,.
The blood having returned from body is relatively low in oxygen and high in carbon dioxide. On the other hand the alveolar air has higher oxygen concentration and lower carbon dioxide concentration.
Thus, when venous blood flows through pulmonary capillaries, oxygen moves from alveoli into the capillaries while carbon dioxide flows from capillaries into the alveoli.
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
Http://corse-scottsbiologyzone.weebly.com/uploads/4/4/9/6/4496747/genetics_review_-_answers.pdf
its question 5 in the document that's where you will find the answer
Answer:
a
Explanation:
because he is smart sjsjsjsuzzhss
Answer:
They are about the same size and have about the same mass.
Explanation:
Basically both planets are about the same size therefore that is why Venus is called Earth's twin.