the work of gregor mendel

The work of gregor mendel

OBJECTIVE: Identify the sequence of events that influenced Mendel´s conclusion about genetics .

GREGOR MENDEL

GREGOR MENDEL´S EXPERIMENT

Started with true breeding plants .

Trait: specific characteristics of an individual. (seed color, plant height)

Hybrid: created from cross of true-breeding individuals.

POLLINATION IN A PEA PLANT

CROSS POLLINATION

pEA CHARACTERISTICS

GENES AND ALLELES

PRINCIPLE OF DOMINANCE

Some alleles are dominant some are recessive.

An organism with recessive allele will exhibit the trait only when the dominant allele is abscent.

An organism with at least one dominant allele will exhibit that trait.

EARLOBE: DOMINANT AND RECESSIVE

DOMINANT: Unattached earlobe

RECESSIVE: attached earlobe

The F2 Generation

What proportion of F2 offspring were yellow?

1/4

What proportion of F2 offspring were green?

3/4

Traits can be:

Homozygous dominant : AA

Homozygous recessive : aa

Heterozygous or mixed hybrid: Aa

How would the offsprings be if both parents are tall (TT) ?

PUNNET SQUARE

How would the offsprings be if both parents are tall mixed hybrids (Tt) ?

PUNNET SQUARE

PUNNET SQUARE

PUNNET SQUARE

Applying Mendel´s principle

PROBABILITY AND HEREDITY

Probability: is the likelihood that an event will occur. If you flip a coin what is the probability of either outcome?: _______________ Each flip is an INDEPENDENT EVENT.

A heterozygous round and yellow pea is crossed with a homozygous recessive wrinkled and green pea. Create a Punnett square and check all the probable combinations.

INTERACTIVE ACTIVITY LOG INTO THE ASSIGNMENT IN YOUR E-BOOK.

OTHER PATTERNS OF INHERITANCE

Codominance

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