How can meiosis and fertilisation result in genetic variation amonst offspring?

Question

How can meiosis and fertilisation result in genetic variation amonst offspring?

Answer 1

Meiosis gives rise to genetic variation and fertilization offers the opportunity to unite with two different combination of alleles.

Answer 2

Meiosis results in genetic variation because during a stage called Pachytene, there occurs crossing over between the maternal and paternal chromosomes, during which segments of the chromosomes are exchanged.

Now, due to this, no two gametes will be exactly similar, resulting in genetic variation even among the offsprings of the same parents.

Answer 3

see  d  process  is  simple   ..........u  know  that  the genetic basis   of  life  is  dna   since  dna  is  present  in  chromosomes................................  change  brought  about  in  chomosomes  bring  about  variation............in  meiosis  crossing  over  takes  place  which   includes  exchange   of  segments  of   chomtids  ..........hence  variation   is brought  about.

fertilisation  includes  or  involves  both  male  n  female  gamete..........crossing  over  in such  case  includes..intermixing  of  characters           or  traits  of  parents........hence  a  variation  occurs  in  d  offspring