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umka2103 [35]
2 years ago
9

Which of the following statements indicates the way in which the body's natural defenses protect the skin from the effects of UV

damage?
Biology
1 answer:
miss Akunina [59]2 years ago
7 0
Provide the statements for the answer
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Maria is concerned because she has been exposed to a small amount of radiation during an X-ray. What is her doctor most likely t
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Stay for an examination
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1 year ago
Read 2 more answers
Match each definition to the appropriate term. locus
liraira [26]
I) Locus- the chromosomal site where a specific gene is located. A locus is a fixed position on a chromosome, like the position of a gene or a marker. Each chromosome carries ,many genes; human's estimated haploid (n) protein coding genes are about 20,000, on the 23 different chromosomes.


ii) Interference; the observed double crossover frequency differs from the expected double crossover frequency. Cross over interference is used to refer to the non-random placement of crossovers with respect to each other during meiosis. It results in widely spaced crossovers along chromosomes. Interference may exert its effect across whole chromosomes. As chromosomes in many eukaryotes are large, interference must be able to act over megabase lengths of DNA. 

iii) Linkage- the tendency for genes located in close proximity on the same chromosome to be inherited together. Normally when two genes are close together on the same chromosome, they do not assort independently and are said to be linked. Whereas genes located on different chromosomes assort independently and have a recombination frequency of 50%, linked genes have a recombination frequency that is less than 50%.

iv) Recombination- the process by which a new pattern of alleles on a chromosome is generated. Genetic recombination is the production of offspring with combinations f traits that differ from those found in either parent. During meiosis in eukaryotes, genetic recombination involves the pairing of homologous chromosomes. This may be followed by information transfer between the chromosomes. 
4 0
2 years ago
If a postsynaptic neuron is stimulated to threshold by spatial summation this implies that ________. If a postsynaptic neuron is
Maslowich

Answer:

The postsynaptic cell has many synapses with many presynaptic neurons

Explanation:

Spatial summation is a process of producing an action potential in a neuron with input from multiple presynaptic nerve cells. This process determines whether an action potential will be triggered upon reaching threshold from multiple synapses with presynaptic neurons. Summation of all inputs determines if an action potential will b generated.

4 0
2 years ago
Why do you think the snowy owls only appear when
miv72 [106K]

Answer:

White owl is the symbol of wisdom. The snowy owl is the symbol of endurance. It represents big dreams along with the ability to achieve them. It is the sign of new beginnings and moving forward with all might.

6 0
2 years ago
Use the model of meiosis that you made earlier in the lesson to explain how crossing over contributes to genetic diversity. How
matrenka [14]

Answer:

Due to exchange of parts of chromosome.

Explanation:

Crossing over is the exchange of segments or parts of chromosome between non-sister chromatids in the meiosis cell division. Due to crossing over, new combinations of genes in the gametes are formed that are not found in both parent which leads to genetic diversity. Crossing over affects the expression of certain traits in the organism because the organism that crossing over have different features as compared to their parents so there is a big difference between organism have crossing over and no crossing over.

3 0
1 year ago
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