HIV, the virus that causes AIDS, is a retrovirus. Which of the following sentences BEST defines a retrovirus?

Biology

1 answer:

rusak2 [61]2 years ago

5 0

Answer:

The answer is D a retrovirus inserts DNA into the host cells genes

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Alexxx [7]

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3 years ago

How is the process of natural selection involved in evolution?

Ann [662]

Natural selection means that the organisms better adapted to their environment, that is, they have developed the right characteristics/skills/response to the external ambient, have higher chance to survive, making the next generations genetically inherit such acquired surviving characteristics.
These generations will thus have a higher chance of survival, making these species being "naturally selected" as survivors, while those who haven't or are slower in this process, have a higher risk of elimination.

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3 years ago

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.

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Bacteria, viruses, fungi, and protists have a bad reputation. People focus on the diseases they cause, the food they rot, and th

Papessa [141]

Answer: viruses

Explanation:

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2 years ago

Check which type(s) of stem cells the characteristics apply to.

ira [324]

Answer:

no clue

Explanation:

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