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nalin [4]
3 years ago
11

What is fitness when we are discussing evolution?

Biology
1 answer:
SCORPION-xisa [38]3 years ago
3 0

Answer:

To an evolutionary biologist, fitness simply means reproductive success and reflects how well an organism is adapted to its environment.

Explanation:

if correct give me brainliest (the crown)

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Define the ratio of sperm to egg?
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Answer:

1,2 × 10⁹ : 1

Explanation:

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You have isolated a strain of temperature-sensitive mutant yeast that divides normally at 25°C. However, at 37°C, the mutant pau
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Answer:

Explanation:

A. Inactivation of an enzyme that degrades M-Cyclin.

         M-phase cyclins form M-CDK complexes and drive the cell's entry into mitosis from G2 phase as non-degradation of M-Cyclin resulting from inactivated enzyme can only result in constitutive entry of the cell in to M phase instead cell cycle being arrested at G2 phase,

         

B. Inactivation of the Wee-1 kinase.

         Wee1 is a nuclear kinase that plays a key role in regulating cell cycle progression. Wee1 inhibits the entry of the cell into M phase by inhibiting Cdk1. Wee1 phosphorylates Cdk1 there inhibiting the kinase activity of Cdk1 which is essential for progression from G2 to M phase. As such any mutation of wee1, and the resulting loss of activity will result in premature entry of cells into M phase instead of getting arrested at the G2 phase resulting in smaller yeast cell.

C. Inactivation of the Cdc25 phosphatase

               CDC25 phosphatases removes inhibitory phosphate residues from cyclin dependent kinases resulting in the activation of CDKs which causes the cells in G2 phase to entry to M phase. Mutation in CDC25 phosphates removes the ability of CDC25 to remove phosphate residues from CDKs thus preventing the entry into M-phase.

Therefore, mutant phenotype of cell cycle arrest prior to M phase can only result form mutation in

Cdc25 phosphatase(option 3)

6 0
4 years ago
Cells require lipids to
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Cell membranes are important because they protect the cell and control the materials that flow in and out of it. Lipids are needed in order to create the membranes in the cell.

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What is the difference between a magnifying glass and a compound light microscope?
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A magnifying glass is a lens that produces an enlarged image, typically set in a frame with a handle and used to examine small or finely detailed things such as fingerprints, stamps, and fine print. A compound light microscopes have a combination of lenses that enhances both magnifying powers as well as the resolving power.

Explanation:

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3 years ago
what is the cytoplasm? a) a mixture of sugars and starches b) a mixture of organelles and cytosol c) a matrix of proteins and ca
fredd [130]
<span>b) a mixture of organelles and cytosol </span>
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