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krek1111 [17]
3 years ago
7

Explain how a testcross can provide evidence for or against linkage.

Biology
1 answer:
MrRa [10]3 years ago
7 0

Answer:

Testcrosses clarify linkage because each phenotypic class of progeny corresponds to each gamete type produced by the dihybrid parent.

Explanation:

  • A test cross involves the crossing of an individual with another phenotypically recessive individual so as to determine the zygosity of the former by analyses of the proportions of offspring phenotypes.
  • In order to determine linkage, the test cross shows that if the parentals are more than the recombinants, we can say that the two genes such as b and c  are genetically linked and therefore, they must be on the same chromosome.
  • Also, the test-crosses help to find out which alleles came from which parent.
  • By setting up testcrosses in which one parent is homozygous for the recessive alleles of both genes,we can analyze the gene combinations received in the gametes from the other, doubly heterozygous parent.
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If a plant looks purple, which light color is causing the plant to photosynthesize?
Vikki [24]

Answer:

Purple

Explanation:

To perform photosynthesis, violet light is the most important color, and it's from these wavelengths that plants get most of their energy. The reason for this is because out of the visible spectrum, red light is the longest wavelength light that the photosynthesis process can use, but it has the least energy

6 0
2 years ago
Which single factor would most likely account for this trend?
goldenfox [79]
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3 years ago
1)Most of the food we eat can be influenced by whom?<br><br> 2)Food choices come from what?
Fantom [35]

Answer:

1) Hunger, savor, appetite. Three main biological reasons why we eat. Also, the economic ability to pay for the food. And the fisical capability to go and buy food, to cook.

2) Our physiological needs are the main reason why we choose food. People need energy to survive.

Everyone would like to have the possibility to eat what he wants. But food choices depend on the financial situation, social class, and preferences.

That is why poor people or people who have less money to spend on food, often eat food that can feed more people but it doesn’t have nutritional values. When people have money, they immediately have a wider spectrum of groceries that can choose from.

Explanation:

Savour is equal to enjoying. When people are not hungry they are happier. We choose what to eat depending on the look, taste, smell, texture. As sweets smell good, people consider them the most attractive food. Food is not just the source of nutrition, it is also the source of satisfaction.

5 0
3 years ago
Which cells are required to process and present antigens from foreign material as the initial step in the immune response?
Alexxandr [17]
<span>The macrophage is the cell responsible for detecting, engulfing and destroying pathogens and apoptotic cells. These cells process and present antigens (foreign materials) to immunocompetent cells and thus they are the key mediators in the development of all immune reactions.</span>
6 0
3 years ago
Each cell has a structure that separates the inside of the cell from.the environment. What cell is this?
kotykmax [81]

Answer:

Either the cell wall or the cell membrane.

Explanation:

All cells have cell membranes which line the outside of the cell, and some cells have cell walls, which also line the outside of the cell. Since all cells have cell membranes I am inclined to believe that the correct answer would be cell membranes.

8 0
3 years ago
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