Cell reproduction

Sex chromosomes

Chromosomes

Parts

Parts

Types

Types

Nucleus in division

Change apperance

r

nuclear lamina and nucleoi disapear and nuclear membrane breaksThe contents are distributed throughout the cytoplasm

DNA packaging

DNA packaging

The nucleus

Nuclear membrane

r

It has two membranes, also it have pores were the molecules go out and in

Centrosome

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Only appear in animals during interphase

Chromatin

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Is made up of DNA and proteins

Nucleoi

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Were the molecules are synthesised

Nucloplasm

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internal content of the nucleus

Nuclear lamina

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Is a protein structure located in the inner face of the plasma membrane

number of chromosomes

Haploid

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Is only one set of chromosomes and is represented as n

Diploid

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Is the total number of chromosomes and is represented as 2nEach paired of chromosomes that come from a different parent, this pairs are called homologus chromosomes

Kariotypes

Complete set of pairs of chromosomes of a cell

The human kariotypes

The human kariotypes

Reproduction

asexual

r

A single parent produce a new generation of living things

Budding

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A bud appears on an unicellular organisms and a new individual is form

Fragmentation

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Multicellulaar organisms divide into diferent segments and from this segments appear a new individual

Multiple fision

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The nuclei is divided into differet small daugthers that before are released

Binary fission

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A cell divide the nucleus and then the cytoplasm into two equally daugther cells

sexual

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This needs two parents to reproduce

Have different processes

1º. Gametogenesis

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Formation of gametes

2º. Fertilisation

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Fusion of gametes

3º. Embryonic development

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The form of embryo after the zygote division

4º. Postembryonic development

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After germination and formation of adult

Cell cycle

Interphase

G1 Phase

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Cell increases in size and synthetize proteins

S Phase

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Hereditary material duplicates

G2 Phase

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The cell divides into two

M phase

mitosis or divison of the nucleus

cytokinesis or division of the cytoplasm