Download Intro to Mendelian Genetics

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Gregor Mendel
Mendel’s Peas
Advantages of pea plants for genetic study:
● There are many varieties with distinct heritable features, or
traits (such as peacolor)
● Mating of plants can be controlled
● Quick generation time; lots of offspring
● Can isolate true-breeding lines for particular traits
Genotype determines Phenotype
__________________ = an organism’s genetic makeup
__________________ = an organism’s physical appearance
Two Possible Phenotypes
Mendel said each
phenotype is
determined by an
_____________, which
is a version of a gene
For each phenotype,
there are ___ possible
alleles
Two Possible Phenotypes
Each offspring inherits
____ allele for each
gene from each parent
An organism’s genotype
is made up of ____
alleles for each trait
Homozygous vs. Heterozygous
If an organism has two
copies of the same
allele it is called
_______________
If an organism has two
different copies of the
same allele it is called
_______________
Dominant vs. Recessive
Some alleles are ____________.
If an organism has just one dominant
allele in its genotype, it will have the
dominant phenotype.
The other allele is ______________.
It It only shows up in the phenotype if
an organism has two recessive alleles
Dominant vs. Recessive
ATGTTCGTACGTAGCATTTAGCGAT
CGTATTGCGATATATAGCGTGTAAA
G
Homozygous or Heterozygous?
Phenotype?
BB
Bb
bb
B = Brown
b = blue
Homozygous or Heterozygous?
Phenotype?
RR
Rr
rr
R = Round
r = wrinkled