Genetics and Human Disease

Genetics and Human Disorders

Multiple Choice

An offspring will receive how many alleles from each parent to determine a specific trait?

• 1

• 2

• 3

• 4

Multiple Choice

Having two of the same genes for the trait (sometimes called purebred).

• Heterozygous

• Homozygous

Multiple Choice

having two different genes for a trait (sometimes called hybrid).

• Heterozygous

• Homozygous

Multiple Choice

An allele whose trait only shows up when no dominant allele is present.

• Dominant Allele

• hidden allele

• present allele

• Recessive allele

Multiple Choice

If T=Tall & t=short, what is the genotypic ratio?

• 1:3

• 2:2

• 1:2:1

• 3:1

Multiple Choice

Genotype refers to the ...

• physical expression of the genes

• the possible combination of alleles in a gene

• whether an allele is dominant or recessive

• how an organism will appear

Multiple Choice

What is a phenotype

• The physical trait

• The genetic make up (code)

Open Ended

What are some examples of phenotypes?

Multiple Choice

Term for an organism that display two dominant phenotypes at the same time

• codominance

• incomplete dominance

• pleiotropy

Multiple Choice

Wavy hair is a mix of curly and straight hair. Which of the following expalains this blending of traits?

• codominance

• incomplete dominance

• pleiotropy

Multiple Choice

This is a pedigree that follows blue eyes which is a recessive trait. What is the genotype for the female in the first generation?

• BB

• Bb

• bb

Multiple Choice

This pedigree represents the inheritance of hemophilia in this family. How many of the females have the hemophilia trait?

• 2

• 3

• 5

• 4

Open Ended

Is this trait (the shaded individuals) dominant or recessive? How do you know?

Open Ended

What is the genotype of the father in the first generation?

Open Ended

What is the genotype of individual 3 in the second generation? How do you know?

Multiple Choice

The pedigree above shows the passing on of colorblindness.  What sex can ONLY be carriers of colorblindness? 

• Males

• Females

• Males & Females

• None

Open Ended

Is it possible for individual IV-2 to be a carrier? Why

With this in mind, what kind of non-mendelian trait is colorblindness; autosomal dominant, autosomal recessive, x-linked dominant, x-linked recessive? How do you know?

Open Ended

 Why do all the daughters in generation II carry the colorblind gene?