Biology
This produces sex cells i.e. sperm and eggs. The sex cells (gametes) have half the number (haploid) of chromosomes, so that when fertilisation occurs the fertised egg has the full compliment of chromosomes (diploid). Look at the following sequence, which shows you step by step what hapens at each stage.
Meiosis Sequence
- Haploid Chromosome Number
For humans the haploid number of chromosomes is 23 because their diploid number is 46; haploid is the half of diploid. For humans only their gametes, or sex cells, are haploid. Haploid means that a particular cell has only one member of each homologous...
- Diploid Chromosome Number
Humans have a diploid chromosome number of 46 chromosomes. In other words, there are a total of 46 chromosomes in human cells. The diploid number varies depending on each species. Having a diploid chromosome number means that an organism?s cells contain...
- #32 Summary Of Cell And Nuclear Division
1. Growth of a multicellular organism is a result of parent cells dividing to produce genetically identical daughter cells. 2. During cell division the nucleus divides first, followed by division of the whole cell. 3. Division of a nucleus to produce...
- #31 Control Of Cell Division, Stem Cell, Haploid And Diploid Cells
Each cell contains genes that help to control when it divides. Cells divide by mitosis only when required. When receives signals from neighbouring cells, it responds by dividing or not dividing. If this control goes wrong, cells may not divide when they...
- Sex Determination In Animals
Sex chromosomes and AutosomesMost of the diploid organisms are with separate sexes. The organisms producing sperms are called males and those producing eggs (ova) are called females. Chromosome is the major factor to determine the sex of an organism. The...
Biology
Meiosis
This produces sex cells i.e. sperm and eggs. The sex cells (gametes) have half the number (haploid) of chromosomes, so that when fertilisation occurs the fertised egg has the full compliment of chromosomes (diploid). Look at the following sequence, which shows you step by step what hapens at each stage.
Meiosis Sequence
- Haploid Chromosome Number
For humans the haploid number of chromosomes is 23 because their diploid number is 46; haploid is the half of diploid. For humans only their gametes, or sex cells, are haploid. Haploid means that a particular cell has only one member of each homologous...
- Diploid Chromosome Number
Humans have a diploid chromosome number of 46 chromosomes. In other words, there are a total of 46 chromosomes in human cells. The diploid number varies depending on each species. Having a diploid chromosome number means that an organism?s cells contain...
- #32 Summary Of Cell And Nuclear Division
1. Growth of a multicellular organism is a result of parent cells dividing to produce genetically identical daughter cells. 2. During cell division the nucleus divides first, followed by division of the whole cell. 3. Division of a nucleus to produce...
- #31 Control Of Cell Division, Stem Cell, Haploid And Diploid Cells
Each cell contains genes that help to control when it divides. Cells divide by mitosis only when required. When receives signals from neighbouring cells, it responds by dividing or not dividing. If this control goes wrong, cells may not divide when they...
- Sex Determination In Animals
Sex chromosomes and AutosomesMost of the diploid organisms are with separate sexes. The organisms producing sperms are called males and those producing eggs (ova) are called females. Chromosome is the major factor to determine the sex of an organism. The...