1/7/15Objective: Who was Gregor Mendel and what were his contributions to genetics?

Do Now:

What is a trait?

Blending Hypothesis- A hypothesis to explain

inheritance What color flower might you expect to

get if you crossed a red and yellow flowered plant?

- Blending of parental traits

Gregor Mendel- The first scientist to experiment

with inheritance

Genetics: the study of heredity

Particulate Hypothesis- Parents pass on to their offspring

separate and distinct factors (genes) responsible for inherited traits

Pure-breeding- true-breeding (purple flowers

produce purple flowers)

Hybrids- The offspring of 2 different true

breeding varieties (ex: a purple and a white flower)

Parental plants = p generation

Hybrid offspring are called the:First filial = F1 generation

When the F1 plants self-fertilize or fertilize each other they are the

Second filial = F2 generation

• Alleles- alternative forms of genes (ex: purple flower or

white flower) - - 2 alleles for the gene, one from each parent

• Homozygous: an individual with two of the SAME alleles

• Heterozygous: an individual with two DIFFERENT alleles

• Dominant: A trait that will appear in the offspring if one parent contributes it, capital letter (B= Brown eyes)

• Recessive: a trait that must be contributed by both parents in order to appear in the offspring, lower case letter (b= blue eyes)

• Crossing 2 parent plants that differ in only one character (trait)