What is a key part of Darwin's idea of natural selection

Biology

1 answer:

dimaraw [331]2 years ago

6 0

The animals that cannot adapt to their changing enviroment will not be able to survive and reproduce.

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Which of the following is a disadvantage of wind as an energy source?

lesya692 [45]

Explanation:

Wind energy is one of the sources of renewable sources of energy that is environmentally friendly.

It uses wind power to generate other forms of energy mostly electricity.

Some of the drawbacks are:

Wind turbines pose serious threat to wildlife. It is common place to see dead birds in areas where wind power is being harnessed.
The quantity fluctuates from time to time. Since wind is an element of weather, it is not always in regular supply as desired.
The cost of constructing wind turbines can be very high a times.

Learn more:

Non-renewable sources of energy brainly.com/question/3386515

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3 years ago

A(n) _____________ is a pattern of dark bands on photographic film that is made when DNA fragments are separated by gel electrop

Ainat [17]

DNA fingerprint is a pattern of dark bands on photographic film that is made when DNA fragments are separated by gel electrophoresis and tagged. The photograph produced is often used to determine whether or not suspects were involved in a crime.

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2 years ago

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Explain Mendel's law of independent assortment and how the 9:3:3:1 phenotypic ratio among the F2 of a dihybrid cross provides ev

GrogVix [38]

Answer:

Explanation:

Mendel's law of independent assortment state that two different genes assort independently in gamete formation.

To reach this conclusion, one has to do a dihybrid cross. This means that two genes responsible for different traits need to be analyzed at the same time.

1) Starting with a parental generation of a cross between two pure lines (homozygous for both genes) with different traits, a plant with yellow and round seeds (YYRR) and another with green and wrinkled seeds (yyrr). The F1 will be phenotypically homogeneous (yellow and round), and genotypically heterozygous (YyRr).

2) If the individuals from the F1 are crossed with one another, we have to do a Punnett Square to determine the phenotypic ratio of the F2.

If the genes assort independently, the F1 individuals will produce their different gametes with the same probability. Each possible gamete will appear in a 1/4 proportion: YR, Yr, yR, yr.
The 9:3:3:1 ratio is a result of analyzing the possible phenotypes that result from the dihybrid cross.

See the attached image for an illustration of the crosses in each generation and the Punnett Square.