Modes of Inheritance

Co-Dominance &
Incomplete Dominance

Multiple Choice

What does a Punnett Square reveal?

• Chances for offspring to inherit a trait

• How many parents a child has

• Your chances of having a male or female baby

• Human Genome

Match

If (A) represents a normal Allele and (a) represents a Colorblind Allele, match the following:

• Female Carrier

• Normal Female

  (Non-Carrier)

• Colorblind Female

• Normal Male

• Colorblind Male

X^AX^a

X^AX^A

X^aX^a

X^AY

X^aY

• X^AX^a

• X^AX^A

• X^aX^a

• X^AY

• X^aY

​Co-Dominance

a type of inheritance in which two versions (alleles) of the same gene are expressed separately to yield different traits in an individual.

Draw

Draw the offspring of a black cat (BB) and white cat (WW), if their traits are co-dominant.

​Incomplete Dominance

a form of Gene interaction in which both alleles of a gene at a locus are partially expressed, often resulting in an intermediate or different phenotype

Draw

Draw the offspring of a Straight Haired Cat (SS) and Curly Haired Cat (CC) if the Alleles have incomplete dominance.

Match

Match the following

• Dominant

• Recessive

• Genotype

• Phenotype

Allele that is always expressed

Allele that is masked when dominant allele is present

Genetic makeup of an organism

Physical characteristics of an organism

• Allele that is always expressed

• Allele that is masked when dominant allele is present

• Genetic makeup of an organism

• Physical characteristics of an organism

Match

Match the following

• homozygous

• heterozygous

• phenotype

• genotype

• allele

having two identical alleles for a particular gene

having two different alleles for a particular gene

the physical characteristics of an organism

the genetic makeup of an organism

alternative forms of a gene

• having two identical alleles for a particular gene

• having two different alleles for a particular gene

• the physical characteristics of an organism

• the genetic makeup of an organism

• alternative forms of a gene

​Non-Mendelian Genetics

• Patterns of inheritance in which traits do not follow Mendel’s laws

• Many traits have more complicated modes of inheritance than just simple dominant versus recessive with two alleles

  • Example: Multiple Allele Inheritance

​Multiple Allele Inheritance

Multiple Allele inheritance means there are more than just 2 alleles

We will use Blood Typing

​Blood Types

Humans have A, B, AB, O
Possible Genotypes:
A= AA or AO * can be also represented as I^AI^A or I^Ai = A
B= BB or BO I^BI^B or I^Bi = B
O= OO ii = O
AB= AB I^AI^B = AB

​Rules for Bloodtyping

Both A and B blood types are Co-Dominant in heterozygous individuals


Both A and B blood types are Dominant to O blood type.

Draw

Cross an individual with AA blood and an Individual with BB blood.

Match

Match the following

• AA

• BB

• O

• AB

• AO

I^AI^A

I^BI^B

ii

I^AI^B

I^Ai

• I^AI^A

• I^BI^B

• ii

• I^AI^B

• I^Ai

Multiple Choice

What is the most probable blood type to result from a cross between AO and BO?

• A

• B

• AB

• O

• They are all equally probable

Open Ended

If a child has type O blood, and it's parents have type A and type B. What are the genotypes of the Parents?

​What is "Blood Typing"?

The allele for blood type codes for antigens (markers) on your blood cells

A type= A antigen
B type= B antigen
O type= NO ANTIGEN

​Blood Typing Continued

Anitgens (markers) are how your body recognizes its own cells versus invaders.

A Allele= B antibodies
B Allele= A antibodies
O Allele = A and B antibodies

Match

Match the following

• Universal Donor

• Universal Recipient

• Antigen

• Antibody

• Blood Cells

Type O

Type AB

Marker on cells

produced by your body to fight invaders

carry oxygen to your cells.

• Type O

• Type AB

• Marker on cells

• produced by your body to fight invaders

• carry oxygen to your cells.