37. Intext question XXVI

 

The equal inheritance of chromosomes from each parent ensures equal genetic contribution of male and female parents in the progeny. Humans have 23 2226  pairs of chromosomes, 22 pairs of sex chromosomes and 1 pair of autosomes23 pairs of autosomes and 1 pair of sex chromosomes22 pairs of autosomes and 1 pair of sex chromosomes26 pairs of autosomes and 2 pair of sex chromosomes. Humans have two sex chromosomes, X and Y. Females have two X chromosomes, while males have one X and one X chromosomeY and one Y chromosomeX and one Z chromosomeX and one Y chromosome. A haploid sperm fuses with a haploid ovum to produce a diploid moruladiploid foetusdiploid embryodiploid zygote  during fertilisation. When a zygote receives an equal amount of genetic material from each parent, it retains its diploid nature after fertilisation.