Question
Thu January 10, 2013 By:

DNA replication in sexual reproduction??

Expert Reply
Sun January 13, 2013
When sperm (haploid) and ovum (haploid) fuses during fertilisation, zygote (diploid) is formed. Since their chromosomes fuse, the zygote formed is a diploid cell. Here intermingling of two sets of haploid genes (male and female) occurs to reconstitute a diploid cell. The diploid zygote then divides, during which the chromosomes are also replicated.
 
In asexual reproduction, the the offspring is identical to the parent, since the same DNA is inherited by the offspring. Variations may appear due to errors in DNA copying and /or mutations.
Ask the Expert