If a fish with genotype Bb (patchwork of blue and red scales) is bred with a fish that only has blue scales (genotype BB), then:♀: Bb♂: BBPossible genotypes: BB, BbPossible phenotypes:Blue scales, Patchwork of blue and red scalesProbability of each:BB - 50%Bb - 50%Blue scales - 50% Patchwork - 50%The codominant alleles B and b will both be expressed in the heterozygote offspring, resulting in a patchwork pattern
Similar to If a fish with genotype Bb (patchwork of blue and red scales) is bred with a fish that only has blue scales (genotype BB), then:♀: Bb♂: BBPossible genotypes: BB, BbPossible phenotypes:Blue scales, Patchwork of blue and red scalesProbability of each:BB - 50%Bb - 50%Blue scales - 50% Patchwork - 50%The codominant alleles B and b will both be expressed in the heterozygote offspring, resulting in a patchwork pattern
Similar to If a fish with genotype Bb (patchwork of blue and red scales) is bred with a fish that only has blue scales (genotype BB), then:♀: Bb♂: BBPossible genotypes: BB, BbPossible phenotypes:Blue scales, Patchwork of blue and red scalesProbability of each:BB - 50%Bb - 50%Blue scales - 50% Patchwork - 50%The codominant alleles B and b will both be expressed in the heterozygote offspring, resulting in a patchwork pattern (20)
If a fish with genotype Bb (patchwork of blue and red scales) is bred with a fish that only has blue scales (genotype BB), then:♀: Bb♂: BBPossible genotypes: BB, BbPossible phenotypes:Blue scales, Patchwork of blue and red scalesProbability of each:BB - 50%Bb - 50%Blue scales - 50% Patchwork - 50%The codominant alleles B and b will both be expressed in the heterozygote offspring, resulting in a patchwork pattern
2. LOOP A WORD
B K J K Y I C N X K K Z O
K O Y E P Y T O N E H P H
W B Q I U T K H G B C H D
B H O M O Z Y G O U Z L N
W Z U O G Y Z O R E T E H
L H E R E D I T Y E N E G
T J S V R X X Y S Y Q S N
N G R W D O M I N A N T C
C O A L L E L E G S H F V
E E V I S S E C E R I Y F
B O I G R L Q E H V O W J
J G G E N O T Y P E D R C
N O S G E N E T I C S W P
allele heredity
dominant heterozygouz
gene homozygouz
genetics phenotype
genotype recessive
3. GENES AND ALLELES
Read Pg 92 -A great idea- and answer:
What is
the difference between a
GENE
and
ALLELE?
4. GENES AND ALLELES
ALLELE
A specific variation of a gene. The
allele can be dominant or
recessive.
GENE
Section of DNA that controls a
certain trait. Formed by 2 alleles
(♀ & ♂)
5. GENES AND ALLELES
ALLELE
Blue eyes, green eyes, type A
blood, black skin, white skin
GENE
Eye color, blood type, skin color
6. GENES AND ALLELES
Read Pg 92 and93 -A great idea- and answer:
What is
the difference between a
GENOTYPE
and
PHENOTYPE?
11. Gregor Johann Mendel
Gregor Mendel was an Austrian monk
who discovered the basic principles of
heredity through experiments in his
garden. Mendel's observations became
the foundation of modern genetics and
the study of heredity, and he is widely
considered a pioneer in the field of
genetics.
Synopsis
Gregor Mendel, known as the "father of
modern genetics," was born in Austria
in 1822. A monk, Mendel discovered
the basic principles of heredity through
experiments in his monastery's garden.
His experiments showed that the
inheritance of certain traits in pea
plants follows particular patterns,
subsequently becoming the foundation
of modern genetics and leading to the
study of heredity.
12. Genotype
Tall is dominant over short in pea
plants. Show the cross of a
homozygous short plant is crossed
with a homozygous tall plant.
♀
:
♂
14. Calculate Probabilities
A bag contains 4 red marbles, 16
yellow marbles, 5 purple marbles, 16
blue marbles, and 10 green marbles.
What is the probability of pulling out a red or a green
marble?
What is the probability of pulling out a red marble?
Total number of outcomes
Probability = =
Number of ways it can happen 4
4+16+5+16+10
100
x
15. Genotype
Tall is dominant over short in pea
plants. Show the cross of a
homozygous short plant is crossed
with a homozygous tall plant.
♀: tt ♂: TT
t t
T
T
Probability:
Genotype
Phenotype
Tt = 100 = 100%
4
4
Tall = 100 = 100%
4
4
t T tT
t T tT
16. Practice!
A tall plant (TT) is crossed with a
tall plant (Tt).
♀
:
♂:
Phenotype
Probability:
Genotype
17. Practice!
In humans, free-ear lobes are dominant
to attached. Two parented that are both
heterozygous free are expecting a child.
What are the chances that the child will
have free ear lobes or attached?
♀
:
♂
:
Probability:
Genotype
Phenotype
20. 5. Dominant alleles mask the effects of recessive alleles but co-
dominant
alleles have joint effects
Dominant alleles always show their encoded trait, when present in an
organism (they mask recessive alleles)
Recessive alleles only express their encoded traits when no other alleles are
present
• Dominant alleles code for functional proteins, while recessive alleles code for non-
functional proteins
Codominant alleles can have joint effects if both are
present* *PatterŶs of iŶheritaŶce, like CodoŵiŶaŶce, that do Ŷot follow MeŶdel’s
observations are called Non-Mendelian inheritance patterns.
21. Practice!
In a species of birds, incomplete
dominance between alleles for black
(B) and white (b) feathers is observed.
Heterozygotes are blue. If two blue
birds are crossed, what will be the
possible genotypes and
phenotypes?
♀
:
♂:
Phenotype
Probability:
Genotype
22. Practice!
In a certain fish, blue scales and
red scales are codominant. When a
fish has the genotype Bb, it has a
patchwork of blue and red scales.
What happens if you breed this
fish with a fish that only has Blue
Scales.
♀
:
♂:
Phenotype
Probability:
Genotype