Hello,
Convection currents<span> in the mantle drive plate tectonics. Convection is the reason for o</span>cean currents. Ocean currents<span> result from two processes - the action of wind on the surface of the water, and from variation in water temperature that causes movement.
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Both the mantle and ocean experience <span>the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock; this is called, again, convection.
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The gradual decline in men's testosterone levels in middle age can reduce their sex drive
A quick Google search revealed that Andrew Johnson was the 17th president of the United States.
Answer:
Non-coding DNA regions play important roles in regulating transcriptional activity by encoding different types of non-coding RNAs (ncRNAs), acting as scaffold attachment regions, acting as enhancer specific regions, etc.
Explanation:
Historically, it had been believed that non-coding DNA sequences were 'junk DNA' since they don't encode for proteins (beyond the sequences that are transcribed into functional non-coding RNAs, i.e., transfer RNA and ribosomal RNA). However, in the last years, it has been shown that non-coding DNA sequences play critical roles in regulating gene expression and genome function. For example, evolutionary conserved non-coding RNAs (ncRNAs) with regulatory roles on gene expression such as, for example, long non-coding RNAs (lncRNAs) and microRNAs (miRNAs) have been mapped in non-coding DNA sequences, thereby evidencing the functional significance of these regions. In consequence, the conservative nature of certain non-coding DNA sequences evidence that mutations in such regions may have significant deleterious effects, and thereby they could have a negative impact on the fitness of the individual.
It happens through 3 stages
- Interphase
- Meiosis 1
- Meiosis 2
In Meiosis one the cell produces diploid daughter cells by combining homogeneous and heterogeneous chromosomes.
In Meiosis two these diploids again tear apart to produce haploid daughter cells
