Genetics - Intro to Heredity

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Genetics - Intro to Heredity
← Gregor Mendel
What is Heredity?
Heredity is the delivery of
characteristics from parent
to offspring.
The study of heredity is
called Genetics.
The Role of Fertilization
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●
●
●
●
Male part of flower contains
pollen in reproductive cells
called sperm.
Female portion of the flower
produces eggs.
Reproductive cells joining =
fertilization.
In plants (peas), tiny embryos
develop within a seed.
Pea flowers are self-pollinating!
(aka: true-breeding)
●
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Trait - Special characteristic of an
individual
○ Example: Seed color (peas), hair
color (humans)
Hybrids - offspring of crosses
between parents with different traits
Give me two traits
you have that
came from your
parents!
Genes and Alleles
●
Genes - factors that are passed
from parent to offspring
○ Eye Color, Hair Color, Skin
Color
●
Allele - different forms of a gene
○ Brown, Green, Hazel, Blue
(Eye color examples)
Alleles - Dominant and Recessive
●
Dominant Traits - An organism
with at least ONE dominant trait
will SHOW that trait
●
Recessive Traits - An organism
with TWO recessive traits with
SHOW that trait
Type to label the diagram with either Dominant or
Recessive:
1.
DD
2.
pp
Ll
3.
ee
4.
Segregation
●
Segregation - think SEPARATION
●
P = Parent Generation
●
F1 = First Filial Generation
○ Parents mate - this is their
children.
●
F2 = Second Filial Generation
○ F1 cross F1
Sex
Cells
Gregor Mendel
https://www.youtube.com/watc
h?time_continue=310&v=YxK
FdQo10rE - My Favorite
Scientist - Gregor Mendel
https://www.youtube.com/watc
h?v=GTiOETaZg4w - Sci
Show Gregor Mendel
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