Why do different organisms have a different number of chromosomes?

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Why do different organisms have a different number of chromosomes?

Species (and individuals) are unique because of the content of the DNA that makes up the chromosomes, not the number of chromosomes. As you may already know, chromosomes are made of tightly packed DNA, and DNA is made of incredibly long strands of chemicals called nucleotides.

Do the number of chromosomes similar in all organisms?

All organisms do not have the same number of chromosomes. For example, human cells have 46 chromosomes, each whereas dogs have 39 chromosomes in each…

Do the number of chromosomes an organism has relate to how advanced it is?

So the number of chromosomes has nothing to do with what or how complicated something is. And neither does the number of genes or the number of base pairs of DNA.

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What does this mean in terms of the relationship between chromosome number and organism complexity?

It just means the information is in many more pieces. A related note is that the size of the genome (the number of base pairs) doesn’t correlate with complexity either.

How does the number of chromosomes change in evolution?

Explanation: The present species in the world have vastly different genetic material and number of chromosomes. If the origin of the species is one common ancestor then the number of chromosomes and genetic make up those chromosomes must change.

How does the number of chromosomes in gametes differ?

This process is known as fertilisation. Gametes contain half the number of chromosomes of all other cells in the organism. This means they are haploid . When the male and female gametes combine in fertilisation they create an embryo with the full complement of chromosomes (diploid).

How does chromosome number change mitosis?

So during a mitotic cell cycle, the DNA content per chromosome doubles during S phase (each chromosome starts as one chromatid, then becomes a pair of identical sister chromatids during S phase), but the chromosome number stays the same.

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How do chromosome numbers differ in somatic cells vs gametes?

Human somatic cells have 46 chromosomes: 22 pairs and 2 sex chromosomes that may or may not form a pair. This is the 2n or diploid condition. Human gametes have 23 chromosomes, one each of 23 unique chromosomes, one of which is a sex chromosome. This is the n or haploid condition.