Genetics Test Review

Meiosis produces sex cells in animals. What are these sex cells called?

• Gametes

• somatic cells

• mitosis

• stomata

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

• Incomplete Dominance
• Co-Dominance
• Mendelian Inheritance
• Homozygous 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
• Independent assortment
• Recessive inheritance

Organisms that have two identical alleles for a

particular trait are said to be ____________.

• heterozygous

• homozygous

• recessive

• codominance

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed? (B=brown eyes and b=blue eyes)

• 0 %

• 25%

• 50%

• 75%

If A = red fur and a = white fur, what are the GENOTYPIC ratios of the offspring based on the Punnett Square?

• 25% heterozygous

• 50% purple

• 75% red fur and 25% white fur

• 25% homozygous recessive, 50% heterozygous, 25% homozygous dominant

Punnett Square #1

In plants tall is dominant to short.

Cross two heterozygous plants.

What is the genotypic ratio?

• 1:2:1

• 2:2

• 3:1

In cacti, long arms (A) are dominant to short arms (a).  Suppose 2 heterozygous cacti are crossed.  What percentage of their offspring are expected to have short arms?

• 0%
• 25%
• 75%
• 100%

Dogs have different types of ears. Pricked ears point and stand up straight on the dog's head.

Assume that ear type is determined by a single gene and that the allele for pricked ears is dominant over the allele for floppy ears. In a cross between two dogs

with floppy ears, what percentage of the offspring can be expected to have pricked ears?

• 0%

• 25%

• 50%

• 100%

What causes genetic variation in meiosis?

• chromosomes lining up
• crossing over of chromosomes
• separation of chromosomes
• chromosomes pulling apart