GENETICS
The study of heredity in general and of genes in particular.
“Pattern of Inheritance”
Gregor Mendel
One can determine the likelihood
of producing a child with a
particular trait
MENDELIAN AND
NON-MENDELIAN GENETICS
MENDELIAN LAW OF INHERITANCE
Law of Dominance
In a heterozygote, one trait will
conceal the presence of another
trait for the same characteristic.
MENDELIAN AND
NON-MENDELIAN GENETICS
MENDELIAN LAW OF INHERITANCE
Law of Segregation
A diploid organism passes a
randomly selected allele for a trait
to its offspring, such that the
offspring receives one allele from
each parent.
MENDELIAN AND
NON-MENDELIAN GENETICS
MENDELIAN LAW OF INHERITANCE
Law of Independent Assortment
It states the inheritance of one
pair of factors ( genes ) is
independent of the inheritance of
the other pair.
MENDELIAN AND
NON-MENDELIAN GENETICS
MENDELIAN LAW OF INHERITANCE
Principle of Codominance
a relationship between two
versions of a gene.
MENDELIAN AND
NON-MENDELIAN GENETICS
NON-MENDELIAN INHERITANCE PATTERN
Principle of Multiple Alleles
A type of non-Mendelian
inheritance pattern that involves
more than just the typical two
alleles that usually code for a
certain characteristic in a
species.
LET’S TRY THIS!
1-5 A lawyer sets out to prove that a child with type A
blood is the son of a man with type B blood and a mother
with type AB blood. Determine if it is possible for the man
to be the father. Is he definitely the father?
1.
2.
3.
4.
5.
(a)___________________________
(b)
(c) ___________________________
(d) ___________________________
(e) ___________________________
AB
𝑰𝑨
𝑰𝑩
×
×
B
𝑰𝑩
𝑰𝑩
𝑰𝑨
𝑰𝑩
𝑰𝑩
𝑰𝑨 𝑰𝑩
𝑰𝑩 𝑰𝑩
𝑰𝑩
𝑰𝑨 𝑰𝑩
𝑰𝑩 𝑰𝑩
6-10. In some kinds of cattle, there are two alleles for
coat, R for red and r for white. When an allel for white
and one allele for red combine, the coat is spotted with
red and white, also called roan. Predict the possible
offspring of a homozygous red cow and a roan cow.
1.
2.
3.
4.
5.
(a)___________________________
(b)
(c) ___________________________
(d) ___________________________
(e) ___________________________
RR
𝑹
𝑹
×
×
𝑹
𝑹
𝑹
__
__
𝒓
__
__
Rr
𝑹
𝒓
HF
hF
Hf
hf
HF
hF
Hf
hf
HhFf
11-15. In human
1.
2.
3.
4.
5.
(a)___________________________
(b)
(c) ___________________________
(d) ___________________________
(e) ___________________________
RR
𝑹
𝑹
×
×
𝑹
𝑹
𝑹
__
__
𝒓
__
__
Rr
𝑹
𝒓