The moment of truth arrives when a male's sperm cell and a female's egg cell unite, their halves merging to form a zygote, the first stage of a new life. The zygote inherits one chromosome from each parent, and the X and Y chromosomes, like conductors of destiny, orchestrat...
Gametes form in a cell division process called meiosis, in which a cell splits into four copies instead of the usual two so that the gametes contain half the normal number of chromosomes-just one of each of the 23 pairs normally found in human cells. 'Chromosomal crossover' occurs during ...
The difference between diploid and haploid cells is that diploids contain two complete sets of chromosomes and haploids contain only one set of chromosomes. Haploid cells are produced when a parent cell divides twice, resulting in two diploid cells with the full set of genetic material upon the ...
Explain why the process of meiosis is important for sexual reproduction and the continued diversity of life on earth. For each 23 pairs of chromosomes, the haploid egg cell will have either a maternal or paternal chromosome, but it can...
Generally, the two main factors considered to underlie the production of unreduced gametes are hybridi- zation and environmental factors. Hybrids derived from distant hybridization (hybridization between species or higher-ranking taxa) combine two sets of chromosomes from different taxa. In meiosis, ...