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Juliette [100K]
3 years ago
11

What kind of inheritance does skin colour represent?

Biology
1 answer:
maksim [4K]3 years ago
8 0
The skin color inherits the sex linked (X-links.)
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1. Key Concept List the
Ipatiy [6.2K]
<h2>DNA </h2>

Explanation:    

1) Experiment done by Griffith:

  • Griffith used two related strains of bacteria, known as R and S
  • R bacteria were nonvirulent, meaning that they did not cause sickness when injected into a mouse whereas mice injected with live S bacteria developed pneumonia and died
  • Griffith tried injecting mice with heat-killed S bacteria (that is, S bacteria that had been heated to high temperatures, causing the cells to die), the heat-killed S bacteria did not cause disease in mice
  • When harmless R bacteria were combined with harmless heat-killed S bacteria and injected into a mouse, not only did the mouse developed disease and died, but when Griffith took a blood sample from the dead mouse, he found that it contained living S bacteria
  • Griffith concluded that the R-strain bacteria must have taken up what he called a transforming principle from the heat-killed S bacteria, which allowed them to transform into smooth-coated bacteria and become virulent

2) Experiment done by Avery:

  • Avery, McCarty and MacLeod set out to identify Griffith's transforming principle
  • They began with large cultures of heat-killed S cells and, through a long series of biochemical steps progressively purified the transforming principle by washing away, separating out, or enzymatically destroying the other cellular components
  • These results all pointed to DNA as the likely transforming principle but Avery was cautious in interpreting his results
  • He realized that it was still possible that some contaminating substance present in small amounts, not DNA, was the actual transforming principle

3) Experiment done by Hershey and Chase:

  • Hershey and Chase studied bacteriophage, or viruses that attack bacteria
  • The phages they used were simple particles composed of protein and DNA, with the outer structures made of protein and the inner core consisting of DNA
  • Hershey and Chase concluded that DNA, not protein, was injected into host cells and made up the genetic material of the phage

8 0
3 years ago
When does the separation of sister chromatids occur? A. Meiosis 1 B. Meiosis 2 C. Before Meiosis D. After Meiosis
Nata [24]

Answer:

option B is correct that is meiosis 2

Explanation:

the two sister chromatids are separated from each other into two different cells during mitosis or during the second division of  meiosis

6 0
3 years ago
please help me this is due soon :(( giving brain liest for whoever does it right, and it does it in there own words, ITS OK IF A
ddd [48]

Answer:

In many species, females choose the male they will mate with. For their part, males try to be chosen as mates. They show females that they would be a better mate than the other males. To be chosen as a mate, males may perform courtship behaviors. These are special behaviors that help attract a mate. Male courtship behaviors get the attention of females and show off a male’s traits. These behaviors are often observed as direct competition between males.  Different species have different courtship behaviors.

Explanation:

4 0
3 years ago
In gel electrophoresis why does the dna move toward the bottom of the wall of gel
Yanka [14]
The answer is an electric current.
An electric current is running through the gel <span>in the electrophoresis with positive pole on the bottom.</span>Since DNA is negatively charged, it migrates <span>toward the positive pole of the gel, respectively, </span><span>it migrates toward the bottom of the gel.</span>
4 0
3 years ago
Please help!! The available chemical energy in an ecosystem..
Gennadij [26K]

Answer:

C

Explanation:

6 0
3 years ago
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