4. The father of Genetics is Gregory
Mendel
He discovered the basic principles of
heredity by breeding the garden peas
in a carefully planned experiment.
FATHER OF GENETICS
5. Cross pollination-Is the fertilization
between different plants.
True breeding-The organisms with only one
variety type (white flowers can only produce
white flowers).
Hybridization-Mating two true breeding,
contrasting varieties.
FATHER OF GENETICS
6. Law of segregation states that two
alleles for a heritable character
separate (segregate) during gamete
formation and end up in different
gametes
LAW OF SEGREGATION
7. TWO TYPES OF GENETIC CROSSES
Monohybrid cross-A cross between 2
organisms where we only look an one
pair of contrasting traits.
Dihybrid cross-A cross between 2
organisms where we look at two pairs
of contrasting traits at the same time.
10. Law of independent assortment states
that each pair of alleles segregates
independently of each other pair of
alleles during gamete formation.
LAW OF INDEPENDENT ASSORTMENT
11. Two varieties of chromosomes: The
larger X and the smaller Y
SRY gene on the on the Y chromosome
codes for testes development.
Females are XX and Males are XY
DERTEMINING SEX OF THE BABBY
13. sex chromosomes have genes for many
characters unrelated to sex
gene located on either sex chromosome
is called a sex-linked gene
For a recessive sex-linked trait to be
expressed
• A female needs two copies of the allele
• A male needs only one copy of the allele
INHERITANCE OF SEX LINKED GENES
