The genomic content of the nucleus us constant for a given species where as the extra chromosomal dna is found to br variable among the members of the population
Answers
The genomic content of the nucleus is constant for a given species whereas the extra chromosomal DNA is found to be variable among the members of a population. For humans (Homo sapiens) the genomic content of the nucleus is constant, i.e. 46 chromosomes. But extra chromosomal DNA is found to be variable among the members of the population like different humans have different amount of extra chromosomal DNA in their mitochondria.
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⭐. The total number of genes present in a haploid set of chromosomes of a living cell is called genome.
⭐. This indicates that the genetic material or genomic content of the neucleus is constant for a given species , as the chromosomal number is constant.
⭐. The DNA present in mitochondrai , chloroplast is called extrachrosomal DNA .
⭐. Because of this , the chloroplasts and mitochondria can undergo self duplication .
⭐. This extra chromosomal DNA is variable among the members of same species .
⭐. In some bacteria , extra chromosomal DNA is in the form of plasmids .
⭐. They exist independently in the cytoplasm .
⭐. These plasmids can render bacteria drug resitance .
⭐. This extra chromosomal DNA is also not constant among the members of the same species.