Basic patterns of human inheritance

Identify the condition characterized by the absence of melanin

• albinism

• cystic fibrosis

• galactosemia

• Tay-Sachs

An individual with Tay-Sachs disease would be identified by which symptom?

• excessive mucus production

• an enlarged liver

• a cherry-red spot on the back of the eye

• vision problems

Under what circumstances will a recessive trait

be expressed?

• A recessive allele is passed on by both parents

• One parent passes on the recessive allele

• The individual is heterozygous for the trait.

• There is a mutation in the dominant gene

Tags

NGSS.HS-LS3-1

Which is the genotype of a person who is a carrier for a recessive genetic disorder

• DD

• Dd

• dd

• dE

Use the figure to describe what the top horizontal

line between numbers 1 and 2 indicates

• A. 1 and 2 are siblings

• 1 and 2 are parents

• 1 and 2 are offspring

• 1 and 2 are carriers

If a genetic disorder is caused by a dominant

allele, what is the genotype of those who do

not have the disorder?

• heterozygous

• homozygous dominant

• homozygous recessive

Organisms that have two identical alleles for a particular trait are said to be

• hybrid

• homozygous

• heterozygous

• dominant

Dominant genetic disorder that affects the nervous system

• Huntingtons disease

• cystic fibrosis

• Galactosemia

• Albinism

Which of the following are examples of recessive genetic disorders

• huntingtons disease, Albinism

• Achondroplasia, Tay-Sachs disease

• Galactosemia, Cystic fibrosis

• Huntingtons disease, Achondroplasia

Which is not a characteristic of a person with cystic fibrosis

• chloride channels defect

• digestive problems

• lack of skin pigment

• lung infections