Basic Patters of Human Inheritance

What is the genotype of a heterozygous organism? 

• Hh
• HH
• hh

In a pedigree diagram, ( **DEFINITION: a diagram that can trace a particular trait being passed through generations** ) there is a square and circle.  A square means male. What does the circle mean?

• Deceased 
• Newly Born
• Female
• The carrier (** DEFINITION: an individual who is heterozygous for a recessive disorder)

Tags

NGSS.HS-LS3-2

Albinism is a recessive genetic disorder.  An individual who has two recessive alleles will be albino; while an individual with one dominant allele will not. What is the definition of a recessive genetic disorder? 

• One copy of an abnormal gene must be present for the disease or trait to develop. 
•  Two copies of an abnormal gene must be present in order for the disease or trait to develop?

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Look up the following genetic disorders and pick the disorder that is a recessive genetic disorder.
(1)Huntington's Disease
(2)Cystic Fibrosis 
(3)Achondroplasia 

• Huntington's Disease
• Cystic Fibrosis 
• Achondroplasia
• They are all recessive genetic disorders.

If a recessive genetic disorder mean that you need 2 abnormal alleles to express the disorder.  What dose a dominant genetic disorder mean?

• An individual only needs 1 abnormal allele to express the disorder. 
• An individual needs 2 abnormal alleles to express the disorder. 
• An individual will never express the disorder.
• An individual needs 3 abnormal alleles to express the disorder. 

In a pedigree a solid color means the individual is either homozygous dominant or homozygous recessive for the trait being tracked. What does it mean to have 2 colors in a circle or square?

• Dominant
• Heterozygous
• Male 
• Homozygous

Tags

NGSS.HS-LS3-1

What does this pedigree mean?

• Two parent have 3 offspring. All are heterozygous for the traced trait.
• Two parents have 3 offspring.  All are homozygous. Two individuals have the traced trait.
• Three parents have 2 offspring. All are heterozygous for the traced trait. 
• Three parents have 2 offspring. All individuals are homozygous. Two individuals have the traced trait. 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is a carrier? 

• An individual is heterozygous for a dominant recessive genetic disorder.
• An individual is homozygous for a recessive genetic disorder. 
• An individual is heterozygous for a recessive genetic disorder. 
• An individual is homozygous for a dominant genetic disorder. 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Can an individual be a carrier for a dominant  genetic disorder. 

• Yes 
• No