Although we room all unique, there are often obvious similarities in ~ families. Perhaps you have the very same nose together your brothers or red hair choose your mother? family similarities occur since we inherit traits from our parents (in the type of the genes that contribute to the traits).

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This passing of genes from one generation to the next is referred to as heredity. Simple ubraintv-jp.comanisms pass on genes by duplicating their hereditary information and also then dividing to type an the same ubraintv-jp.comanism. More facility ubraintv-jp.comanisms, consisting of humans, develop specialised sex cells (gametes) the carry fifty percent of the hereditary information, then integrate these to type new ubraintv-jp.comanisms. The process that produces gametes is referred to as meiosis.

Meiosis makes sperm and eggs

During meiosis in humans, 1 diploid cell (with 46 chromosomes or 23 pairs) experience 2 cycles that cell division but just 1 ring of DNA replication. The result is 4 haploid daughter cells known as gametes or egg and sperm cell (each with 23 chromosomes – 1 from every pair in the diploid cell).

At conception, one egg cell and a sperm cell integrate to type a zygote (46 chromosomes or 23 pairs). This is the first cell the a brand-new individual. The halving that the number of chromosomes in gametes ensures that zygotes have actually the same number of chromosomes indigenous one generation to the next. This is vital for stable sex-related reproduction through successive generations.

The phases the meiosis in humans


Replication that DNA in preparation for meiosis. After replication, every chromosome becomes a structure making up 2 identical chromatids.

Prophase I

The chromosomes condense right into visible X shaped frameworks that deserve to be quickly seen under a microscope, and homologous chromosomes pair up. Recombination occurs together homologous chromosomes exchange DNA. At the end of this phase, the atom membrane dissolves.

Metaphase I

Paired chromosomes line up along the center of the cell.

Anaphase I

The pairs of chromosomes separate and also move to opposing poles. Either one of each pair deserve to go to one of two people pole.

Telophase I

Nuclear membranes reform. Cell divides and 2 daughter cells room formed, each v 23 chromosomes.

Prophase II

There are currently 2 cells. DNA does no replicate again.

Metaphase II

Individual chromosomes line up along the center of the cell.

Anaphase II

The chromosome duplicates (chromatids) separate and move come opposing poles.

Telophase II

Nuclear membranes reform. There are 4 new haploid daughter cells. In males, 4 sperm cells room produced. In females, 1 egg cell and also 3 polar bodies space produced. Polar bodies carry out not function as sex cells.

Genetic sport is enhanced by meiosis

During fertilisation, 1 gamete indigenous each parental combines to kind a zygote. Due to the fact that of recombination and independent assortment in meiosis, each gamete has a different collection of DNA. This produces a unique combination of genes in the result zygote.

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Recombination or crossing over occurs during prophase I. Homologous chromosomes – 1 inherited indigenous each parent – pair along their lengths, gene by gene. Breaks occur along the chromosomes, and also they rejoin, trading some of their genes. The chromosomes now have genes in a distinctive combination.