Question

In: Biology

Give two reasons why the statement is false Before you were born, the chance that you...

Give two reasons why the statement is false

Before you were born, the chance that you would end up with your exact set of chromosomes from your biological mother and father was (½)

Solutions

Expert Solution

Two reasons that the statement is false are:

  1. Crossing over: In most sexually reproducing organisms gametes, the cells that fuse to produce the next generation are produced after the Germ cells undergo recombination or crossing over. This is a process that involves the exchange of genetic material between non-sister chromatids. This process results in a gamete that has a chromosome complement that is not identical to the parent, since bits of chromosomes have been exchanged, and the haploid genome represents a mosaic of the parental genome.
  2. Independent assortment: Even if crossing over is ignored as being not very impactful, the independent assortment of alleles does affect the chromosomal complement in the gamete. In diploid organisms, like humans, there are two sets of chromosomes, one inherited from the mother and one inherited from the father. When gametogenesis occurs, chromosomes 'assort' independently, meaning that it is very unlikely that all 'paternal' chromosomes form a gamete and all 'maternal' chromosomes form a gamete. Therefore, the chance of getting the exact same chromosomal complement you have from either parent is about 1/46.

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