Genetics Test

Alleles for the A and B blood cell antigens are codominant. The condition where no antigens are present on the blood cells (type O blood) is a recessive trait. Which set of parents can most likely produce a child with type O blood? 

• one parent with type AB blood, and the other parent with type A blood

• one parent with type AB blood and the other parent with type O blood

• one parent with heterozygous type A blood, and the other parent with type O blood

• one parent with homozygous type A blood, and the other parent with homozygous type B blood

The combination of alleles (the letters) is called the 

• genotype
• phenotype
• heterozygous
• homozygous

_____________________ is the appearance of an organism, or how it looks

• phenotype
• genotype
• recessive trait
• heredity

This type of inheritance pattern shows BOTH traits in possible offspring

• complete dominance
• incomplete dominance
• co-dominance
• dominant pattern

This type of inheritance pattern is a MIXTURE of both traits.

• incomplete dominance
• co-dominance
• complete dominance
• recessive pattern

Which individual in the first generation is a carrier?

• The male
• The female
• individual 1
• None of the above

How many people in the pedigree are carriers for the disorder? 

• 6 
• 8
• 2
• 9

How many people in this whole pedigree have the trait/disease?

• 2
• 3
• 4
• 6

In humans, the gene for curly hair (H) is incompletely dominant to the gene for straight hair (h). Individuals that are heterozygous (Hh) have wavy hair.

Two wavy-haired heterozygous parents have a child.

What is the likeliness that the child will have wavy hair?

• 1/4

• 1/2

• 3/4

• 4/4

Monohybrid crosses are crosses that examine

• the inheritance of multiple traits.
• only two traits.
• no traits.
• only one specific trait.