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Hitman42 [59]
3 years ago
9

An experiment is a procedure that test a hypothesis by providing data and observations under controlled conditions is this true

or false
Biology
1 answer:
NeTakaya3 years ago
6 0

Answer:

true

Explanation:

By experimentating your testing a theory or hypothesis based on certain criteria to see if your theory is correct. By experimentating you record data to back up your claims.

The theory or hypothesis is just your guess of what may or may not happen based on the criteria your wanting to prove.

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PLEASE HELP AND FAST THANK YOU!!!
Zarrin [17]

Answer:

Statement 1: Homologous chromosomes line up at the equator in pairs.

Name of Phase: Metaphase 1

Sequence: 3

Statement 2: The cell replicates its chromosomes

Name of Phase: S-Phase, Interphase

Sequence: 1

Statement 3: Homologous chromosomes separate and move to opposite poles of the cell

Name of Phase: Anaphase 1

Sequence: 4

Statement 4: Spindle forms, DNA coils up in homologous chromosomes come together in a tetrad; crossing over may occur.

Name of Phase: Prophase 1

Sequence: 2

Statement 5: Events occur in reverse order of prophase 1

Name of Phase: Telophase 1

Sequence: 5

Explanation:

Following is a summary of the events of meiosis:

1. Interphase:

Prepares the cell for division. Duplication of DNA, duplication of centrioles occurs and the cell grows in size. At this stage the cell is diploid (2n).

2. Prophase 1:

First stage of Meiosis 1.The centrioles move to the poles of the cell, the nuclear membrane disintegrates, homologous chromosomes pair up (in the form of tetrad), form a chiasmata and then exchange segments of chromosomes with each other. This process is called crossing over.

3. Metaphase 1:

Involves the arrangement of the crossed over, homologous chromosomes on the metaphase plate which is sort of like a web of spindle fibers that originates from the centrioles.

4. Anaphase 1:

The tetrads arranged on the metaphase plate are pulled apart by the spindle fibers. This is the result of tension that build up in the spindle fibers as they grow towards opposite poles.

5. Telophase 1:

The last stage of meiosis 1. Involves the arrival of the chromosomes at the poles, the nuclear membrane starts to form and the chromosomes start decondensing. Telophase 1 yields 2 daughter cells with half the number of chromosomes as that in the parent cell.

Meiosis 2:

Meiosis 2 is exactly similar to mitosis. The only difference is that the haploid cells entering meiosis 2 do not duplicate their DNA. Meiosis 2 just involves the separation of the sister chromatids of homologous chromosomes.

  • As mentioned above, interphase does not occur before meiosis 2.
  • Prophase 2 involves the disintegration of nuclear envelope, centrosomes start moving to the poles.
  • Metaphase 2 arranges the chromosomes on metaphase plate.
  • Anaphase 2 separates the sister chromatids from the chromosomes.
  • Telophase 2 develops the nuclear envelope and separates the nuclei of the daughter cells into 2. Nuclear division id followed by cytokinesis (division of cytoplasm). Telophase 2 result sin 4 haploid daughter cells with one chromatid from each chromosome.
7 0
3 years ago
Which describes the horizons in a soil profile? Horizon A is mineral deficient. Horizon O forms from organic material. Horizon B
andrew-mc [135]
Answer: Horizon O forms from organic material. And Horizon C is least affected by the soil formation process. Bedrock lies below the soil layers.
6 0
3 years ago
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A regular progression of species replacement is called __________.
skad [1K]

Answer:

this should help you figure this out!

Explanation:

a somewhat regular progression of species replacement is called succession consists of a community and all the physical aspects of its habitat such as the soil water and weather. Ecosystem.

4 0
3 years ago
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Which characteristic is common in old rivers?
Semmy [17]

your answer is a hope this helps

6 0
3 years ago
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The smallest unit that ca carry on all the processes of life
Dafna1 [17]
A cell or Atom is something that can process life or can processed into an object. (The atom is in objects and life Such as animals and humans as a cells in just humans and animals


5 0
3 years ago
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