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Biology Week 2 (Mendel’s Model ((THIRD:
if the two alleles at a locus…
Biology Week 2
Mendel’s Model 
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THIRD:
if the two alleles at a locus differ, then one
(the dominant allele) determines the organism’s
appearance, and the other (the recessive allele)
has no noticeable effect on appearance
FIRST:
• For example, the gene for flower colour in pea
plants exists in two versions, one for purple
flowers and the other for white flowers
• These alternative versions of a gene are now
called alleles
• Each gene resides at a specific locus on a
specific chromosome
• FOURTH:
(now known as the law of segregation):
the two alleles for a heritable character separate
(segregate) during gamete formation and end up
in different gametes
SECOND:
for each character, an organism
inherits two alleles, one from each parent
• Mendel made this deduction without knowing
about the role of chromosomes
• The two alleles at a particular locus may be
identical, as in the true-breeding plants of
Mendel’s P generation
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DNA Replication
DNA
Hereditary Material
Alleles are forms of the same gene with small differences in sequence of DNA bases #
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Located in Cell Nucleus #
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