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Neko [114]
3 years ago
9

Polytene chromosomes of Drosophila salivary glands each consist of multiple identical DNA strands that are aligned in parallel s

tructures. How could these arise?
Biology
1 answer:
rewona [7]3 years ago
5 0

Answer:

Polytene chromosomes may be defined as the giant chromosomes that contain alternate dark and light bands when view under the microscope. These chromosomes are found in the salivary gland of Drosophila.  

These glands are functionally highly active and contain thousand of DNA strands. These chromosomes are aligned parallel with each other as the replication is normal but the cells are unable to separate and fails to undergo the process of cytokinesis.

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A nurse observes a 10-month-old infant chewing on the security alarm attached to his identification bracelet. the nurse should:
horrorfan [7]
The answer to this question would be: 3. distract the infant with a more appropriate toy.<span>
An infant wouldn't understand the instruction given by the nurse. It is more appropriate to give the infant another toy to distract him/her from the bracelet. The </span>identification bracelet is important to make sure that a procedure is done for the right patient and shouldn't be removed before the admission is over.
3 0
3 years ago
The key to the evolution of altruism is that a. recipients have to be more likely to carry the altruistic allele than nonrecipie
cupoosta [38]

Answer:

The correct answer is b. actors have to be more likely to carry the altruistic allele than non actors.

Explanation:

Altruism is the behavior by an organism that benefits other organisms by costing its own fitness. The actor is the individual who is doing altruism and the recipient is the individual who is getting benefited by the actor's altruism.

An example of altruistic behavior can be seen in animal kingdom easily. Vampire bats give blood to those members of the community who were not able to go for search for blood show altruistic behavior.

Actors have altruistic genes that suggest them to behave altruistically. Non-actors may not contain alleles of altruism but the recipient might have altruistic alleles.

Hamilton's rule says that natural selection will favor the altruistic allele when rb > c.

where r = coefficient of relatedness between donor and recipient

          b = benefit received by recipient and

          c = cost paid by altruist.

Therefore, the correct answer is b.

6 0
3 years ago
Translation begins when _______ in the cytoplasm attaches to a _________
AysviL [449]
When a Ribosome in the cytoplasm attaches to a mRNA molecule (I’m in 9th grade and we did this last semester so I’m pretty sure it’s right) :)
6 0
3 years ago
You cross purple-flowered and white-flowered pea plants, and all offspring are purple. how come? select one:
Vaselesa [24]
To solve this problem on genetic dominance, we will need a punnet square.

Let's let P represent purple-flowered and p represent white-flowered.

We have one purple flowered plant with the alleles PP, and we have one white flowered plant with the alleles pp. Using a punnet square, we can determine the alleles of the offspring.

       <u>P</u>     <u>P</u>
p|    Pp   Pp

p |   Pp   Pp

As we can tell from our punnet square, all of our offspring will have purple flowers. This is because the purple-flower allele is dominant and the white-flowered allele is recessive.

Since each flower has a dominant and recessive allele, they are heterozygous.

Therefore, the solution to this problem is D.
3 0
3 years ago
An organism is a multicellular consumer made of eukaryotic cells. To what kingdom does it belong?
lisabon 2012 [21]
Kingdom Animalia is the kingdom multicellular consumers. Remember that plants are producers mostly, and that Fungi can sometimes be single celled.
7 0
3 years ago
Read 2 more answers
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