Patterns of Inheritance

What percentage of the offspring will have this recessive disease?

• 100%
• 25%
• 50%
• 75%

What percentage of the female offspring will be a carrier for this recessive disease?

• 0%
• 50%
• 100%
• 25%

In fruit flies, eye color is a sex linked trait. Red is dominant to white. What would be the percentages of offspring of a cross between a white-eyed female with a red-eyed male?

• 1 female white eyes, 1 female red-eyes, 1 male white eyes, 1 male red-eyes
• 2 female red eyes, 2 males white eyes
• 2 female white eyes, 2 males red eyes
• 2 female red eyes, 1 male red eyes, 1 male white eyes

If a woman is a carrier for a sex linked recessive trait of hemophilia and her husband has hemophilia, which of the following is true?

• All sons will have hemophilia
• all daughters will have hemophilia
• 50% of daughters and 50% of sons have hemophilia
• 100% of sons have hemophilia and 100% of daughters are carriers

What type of inheritance do two alleles have if their traits blend together? 

• Incomplete Dominance
• Co-Dominance
• Dominant / Recessive Inheritance
• Homozygous Inheritance

A pattern of inheritance in which a trait is carried on one of the sex-determining chromosomes.

• Dominant Inheritance
• Co-dominance
• Incomplete dominance
• Sex-linked inheritance

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

• Incomplete Dominance
• Co-dominance
• Sex-linked inheritance
• Recessive inheritance

A roan cow shows co-dominance in fur color (orange and white). What is the phenotype ratio expected if a roan cow and a roan bull mate together?

• 4 Orange : 4 White
• 1 Orange : 1 White
• 2 Orange: 2 Roan : 0 White
• 1 Orange : 2 Roan : 1 White

How are incomplete dominance and co-dominance different than a normal dominant / recessive pattern of inheritance?

• There is no difference
• The heterozygous genotype has a unique phenotype
• There is no heterozygous genotype
• There is only one phenotype regardless of genotype.

A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be:

• all black
• all white
• all gray
• speckled black and white