Inheritance

What chromosomes are involved in sex-linked traits?

• Autosomes

• Mitochondrial DNA

• X and Y chromosomes

• Chromosomes 1 and 2

How many chromosomes are typically found in a human?

• 23

• 46

• 92

• 44

Why are sex-linked recessive traits more common in males?

• Males have two Y chromosomes

• Males have two X chromosomes

• Males have no X chromosomes

• Males have one X and one Y chromosome

Can there be sex-linked dominant traits?

• No, all sex-linked traits are recessive

• Yes, but it requires two dominant alleles

• No, sex-linked traits do not follow dominant-recessive patterns

• Yes, and it only takes one dominant allele to show the trait

Which of the following is not a correct statement about genetic disorders?

• Genetic disorders can have external factors affecting them

• Some genetic disorders can have multiple genes interacting together

• Not all disorders with a genetic component are caused by a single gene

• All genetic disorders follow a one gene trait pattern

A long-haired female rabbit and a short-haired male rabbit produced this offspring with a medium-length coat:

• Incomplete dominance

• Codominance

• Complete dominance

Chicken feathers are inherited through codominance. When a black chicken BB is mated with a white chicken WW, the resulting phenotype is called erminette BW.  

 

If two checkered/erminette chickens are crossed what are the chances of a checkered chicken?

• 50%

• 25%

• 75%

• 100%

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

• Incomplete dominance

• Codominance

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).

Cross a red flower with a blue flower.

• 1 red, 2 speckled, 1 blue

• 2 red, 2 blue

• 4 speckled

• 1 red, 1 speckled, 2 blue

In cattle red coats are represented as RR, and white coats are represented as WW.

What is the genotype for Roan color?

• RR

• RW

• WW