Which option(s) correctly describes chromosomes?

1 answer:

8 0

Answer:In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

Chromosomes are not visible in the cell’s nucleus—not even under a microscope—when the cell is not dividing. However, the DNA that makes up chromosomes becomes more tightly packed during cell division and is then visible under a microscope. Most of what researchers know about chromosomes was learned by observing chromosomes during cell division.

Each chromosome has a constriction point called the centromere, which divides the chromosome into two sections, or “arms.” The short arm of the chromosome is labeled the “p arm.” The long arm of the chromosome is labeled the “q arm.” The location of the centromere on each chromosome gives the chromosome its characteristic shape, and can be used to help describe the location of specific genes.

You might be interested in

If a sudden outbreak of disease severely reduced the number of coyotes in an ecosystem very rapidly, what might the resulting ch

Nikitich [7]

Answer:

Over population

Explanation:

With the coyotes gone, they're prey will have little to no predators. Without their numbers decreasing as quickly (because of the coyote population drop) they will be able to repopulate quicker and less of them will die. This will lead to over population.

6 0

3 years ago

1. What is the contour interval on this map?

alexdok [17]

Answer:

100 is the contour interval of this map

6 0

2 years ago

A cell membrane has a double layer of molecules. These molecules are made up of a phosphorus-containing “head” and two long, fat

podryga [215]

D I believe, in the picture that is attached explains

6 0

3 years ago

1)Which of the following is a source of genetic variation

Svetllana [295]

The answer is; B

Mutations change the order of nucleotide and therefore affects codons that code for proteins. A different protein is thus produced from the wild type hence creating variations. Genetic shuffling in sexual reproduction, also called gene recombination occurs during meiosis and also when different organisms exchange genetic material such as in bacteria.

6 0

3 years ago

In a species of fish, fin shape is controlled by a single gene that has only two alleles. In a generation of 185 fish, the frequ

scZoUnD [109]

The correct answer is: The recessive allele produces a phenotype that is better able to survive and reproduce than the dominant phenotype.

Natural selection (adaptation mechanism), gene flow, and mutation combine to change allele frequencies across generations. Natural selection tends to increase in frequency beneficial alleles, while it tends to decrease in frequency deleterious alleles.

5 0

3 years ago