Kef def + mendel

What did Mendel study

How characteristics where passed on between generations of plants

Describe both of his experiements

1.He crosses a tall pea plant with a dwarf pea plant which all produced tall plants

2.He crossed two of the tall offspring together which produced 3 tall 1 dwarf

What are characteristics determined by

Hereditary units and these are passed from parent to offspring unchanged, one from each parent which are either dominant or reccessive

why was his work not recognised

The heredity units known now as genes were not known about at the time by other scientists

Gene

A section of DNA that codes for a particular protein

Alleles

Different variations of the same gene

Phenotype

The physical characteristics of an organism

genotype

The combination of alleles that controls each characteristic.

homozygous

two copies of the same allele

HETEROZYGOUS

Two alleles of a gene are different

Dominant allele

always expressed

recessive allele

only expressed if two copies are present

Chromosome

Thread like structures of DNA carrying genetic information in the form of genes.