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4 years ago

What function does recombination by crossing-over have in genetic variation?

1 answer:

3 0

Answer: Crossing-over allows the genes that come from each parent to recombine before they are passed on to future generations because chromatids of homologous chromosomes mate and exchange sections of their DNA.

Explanation:

Chromosome crossing-over is the process by which chromatids of homologous chromosomes mate and exchange sections of their DNA during prophase I of meiosis, when pairs of homologous chromosomes, or of the same type, are aligned. The chromatids of the homologous chromosomes break off in the chiasmas and rejoin to allow recombination of the linked genes. So it occurs when regions at chromosome breaks mate and then reconnect to the other chromosome. The result of this process is an exchange of genes, called genetic recombination.

This allows the genes that come from each parent to recombine before they are passed on to future generations. Then, it is an important source of genetic variability, since it involves an exchange of segments between homologous chromosomes during the development of gametes. This process allows that the descendants of an individual are genetically very different, since it is very unlikely that an individual produces two equal gametes, because all of them have different segments of the homologous chromosomes.

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A population of 6000 ants lives inside a dead log that measures 3 square meters. What is the population density of the ants?

BartSMP [9]

Answer:

2000 ants per square meters.

Explanation:

The population density, D, of a population can be calculated by dividing the total number of individuals by the area covered by that population. That is;

D = N/A

Where;

D = population density

N = population of individual organism

A = area covered (m²)

According to this question, a population of 6000 ants lives inside a dead log that measures 3 square meters. Hence, N = 6000 ants, and A = 3m²

Therefore, the population density (D) = 6000/3

= 2000

The population density is 2000 ants/square meter.

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3 years ago

What do Americans say is the most desired characteristic in a marriage partner?

Lunna [17]

Answer:

option A

Explanation:

The correct answer is option A

According to United Census Bureau the most important desired characteristic in a marriage is found out to be LOVE.

Emotional stability and Maturity is the second most important feature which Americans think desired characteristics in a marriage.

It is believed that the 20th century is of "LOVE" marriage.

It is also believed by the Americans that the idea of the marriage should be love based.

5 0

3 years ago

2 what are some of the ways parasites are transmitted from host to host?

Nitella [24]

Parasites will grab on the the host to generate more parasites, and when the cell bursts, the parasites will shoot out in every direction to grab more prey.

8 0

3 years ago

Darla has two different alleles of a gene that controls hair color. She must be _______ for the hair color trait. heterogenous h

zaharov [31]

The answer is heterozygous. It means that she has two different alleles for one specific gene. And homozygous means that it has two same alleles for one specific gene. Heterogenous/homogenous means the different or same between organisms.

4 0

4 years ago

A red flower (Rr is crossed with a white flowers (rr). What are the possible phenotype, and what are the frequencies of those ph

Alchen [17]

Answer:

Explanation: The possible genotypes from this cross are Rr, rr, Rr, and rr. So, that means two offspring will be red and two will be white. The percentage chance for each phenotype is: 50% chance for red flowers and 50% chance for white flowers.

4 0

3 years ago