What is the influence of sex and age on the quantitative cell composition of the human brain? By using the isotropic fractionator to estimate absolute cell numbers in selected brain regions, we looked for sex- and age-related differences in 32 medial temporal lobes comprised basically by the hippocampal formation, amygdala and parahippocampal gyrus , sixteen male years and sixteen female ; and 31 cerebella, seventeen male years and fourteen female These regions were dissected from the brain, fixed and homogenized, and then labeled with a DNA-marker to count all nuclei and with a neuron-specific nuclear marker to estimate neuron number. Total number of cells in the medial temporal lobe was found to be 1. In contrast, no sex differences were found in the cerebellum. Regarding the influence of age, a quadratic correlation was found between neuronal numbers and age in the female medial temporal lobe, suggesting an early increase followed by slight decline after age
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Meiosis, Genetic Recombination, and Sexual Reproduction
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Clue is on a mission to help you understand your body, periods, ovulation, and so much more. Start tracking today. People have sex for pleasure, reproduction, or both. Pregnancy happens when an egg and sperm successfully meet through intercourse or in vitro fertilization. What do they look like, and how many do we all have? The first thing to know: both eggs and sperm are gametes. A gamete is a sex cell that contains half of the genetic material haploid as a normal body cell.
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This page has been archived and is no longer updated. Organisms that reproduce sexually are thought to have an advantage over organisms that reproduce asexually, because novel combinations of genes are possible in each generation. Furthermore, with few exceptions, each individual in a population of sexually reproducing organisms has a distinct genetic composition. We have meiosis to thank for this variety.
Chromosome number , precise number of chromosomes typical for a given species. In any given asexually reproducing species, the chromosome number is always the same. In sexually reproducing organisms, the number of chromosomes in the body somatic cells typically is diploid 2n; a pair of each chromosome , twice the haploid 1n number found in the sex cells, or gametes. The haploid number is produced during meiosis.