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Bess [88]
3 years ago
11

Explain an experimental design

Biology
1 answer:
loris [4]3 years ago
3 0
Experimental design means planning a set of procedures to investigate a relationship between variables. To design a controlled experiment, you need: A testable hypothesis. At least one independent variable that can be precisely manipulated. At least one dependent variable that can be precisely measured
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Describe the ways mutations can affect DNA and chromosomes.​
lozanna [386]
Mutations present permanent and heritable changes in the genome. We distinguish gene and chromosome mutations. Mutations in the level of genes are called point mutations because only one to several nucleotides are changed. These processes are known as deletion, insertion, and substitution. Deletion presents a loss of nucleotides which changes DNA sequence. When new nucleotides are embedded in the DNA chain, it is known as insertion. Substitution implies the process where new nucleotides are inserted while the ones that were present in that specific spot in a DNA molecule are deleted.
Mutations can also appear in chromosomes altering their number and structure. There are four types of mutations - deletion, duplication, inversion, and translocation. In deletion, a whole or one part of a chromosome is lost. Duplication presents an extra copy of a whole or one part of a chromosome. In an inversion, parts of a chromosome change order, while in translocation a part of one chromosome detaches and then connects to another.


hope this helps
6 0
3 years ago
20 heterozygous purple flowering pea plants are crossed. If purple is dominant over white, what are the expected phenotypic resu
Elenna [48]
Let's call the colour alleles C for dominant purple, and c for recessive white.

We have crossed Cc with Cc.  So if we put that in a Punnett square, we'd have a CC, two Cc and a cc.  That would give us a 3:1 ratio of purple to white, so you'd expect 15 purple and 5 white flowers. :)
3 0
4 years ago
If one year was one foot, how long would the Cretaceous be (65 million) in miles?
Harman [31]

If one year was a foot then 65 million years will be 65 million feet. 1 mile=5280 feet so.

65 million divided by 5280= 12310.6

So your answer would be 12,310 miles.

4 0
3 years ago
You would expect to find ____________ fibers in areas that undergo a lot of stretch and rebound.
Stella [2.4K]
You would expect to find elastic fibers
8 0
3 years ago
How do ecologists define an ecosystem?
Free_Kalibri [48]

Answer:

An ecosystem consists of all the organisms in an area, the community, and the abiotic factors that influence that community. Ecosystem ecologists often focus on flow of energy and recycling of nutrients. Biosphere: The biosphere is planet Earth, viewed as an ecological system.

7 0
3 years ago
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