<span>The tropical climate is found northward and southward from the equator to about 15 to 25° of latitude. </span><span>
In tropical climates, where strong insolation makes temperatures high, all that is needed for intense daily convectional storms is </span>a source of humidity. A<span>ll months have average temperatures greater than 18° Celsius.</span>
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➷ These are called 'Bryophtyes.'
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Answer:
C) Through genomic imprinting, methylation regulates expression of the paternal copy of the gene in the brain.
Explanation:
The pattern of gene expression wherein either paternal or maternal gene is expressed in specific cells while the other one is prevented from expression is known as genomic imprinting.
In the given example, the maternal copy of the gene on chromosome 15 is expressed in brain cells while its paternal copy is not expressed in these cells. Hence, the pattern of expression of this gene is regulated through genome imprinting. One of the mechanism is methylation of cytidine residues of CpG islands of the DNA that are more frequently present within promoters of the genes.
When the cytidine residues of these sequences are methylated into 5-methylcytidine, the transcription factors do not bind to these promoters preventing the expression of these genes.
Hence, methylation of cytidine residue in CpG islands of the promoters of the gene present on chromosome 15 could have silenced its expression in brain cells.
Fish and bird are biotic and the bird would hurt the fish depending on the species of birds since some birds are carnivores.
The major purpose(s) of mitosis is for growth and to replace worn out cells.
