If a diploid cell in g2 has 66 dna double helices, it must have pairs of homologous chromosomes

If a diploid cell in G2 has 66 DNA double helices, it must have 33 pairs of homologous chromosomes

Explanation:

Diploid cells (2n) are those that have two chromosomal sets, that is, the chromosomes in these cells are arranged in pairs. Each pair has the same chromosomes (regarding size and shape) and the same genes. These equal chromosomes are called homologues.  In this case, if a diploid cell has 66 chromosomes, we can conclude that these chromosomes are grouped into 33 equal pairs of homologous chromosomes.

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the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.