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  • Front
  • Back

Chromosomes are made up of?

Genes

What are genes made up

DNA

What do genes contain and do

Contain genetic info to make a protein that produces a characteristic

Chromosomes are where?

Inside the nucleus

Zygote

Two nuclei fused together and egg has been fertilised

Embryo

Zygote starts to develop

Karyotype

Map of chromosomes and helps find abnormalities



Numbered In order of size and varies a lot

23rd Chromosomes

Boy - (X,Y)


Girl - (X,X)

How many homologous pairs if a boy

22

How many homologous pairs if a girl

23

Homologous Chromosomes

A pair of chromosomes


Genes for the same characteristics and they match up

Egg give which chromosome?

X

Sperm give which chromosomes

X and Y

Down Syndrome Cause

Extra 21st Chromosome

Down System Effect

Development Disorder

Turner Syndrome Cause

Only 1 X chromosome in 23rd pair

Turner Syndrome Effect

Always a girl


Shorter


Dont produce enough hormones to go through puberty


Not developed sexually

Alleles

A pair of chromosomes (two versions of the same genes)

Diploid Cells

Full set of DNA

Haploid Cell

Half a set of DNA

DNA

Chromosomes coiled into double helix structure