Genetics Review

------is the combination of two alleles that are different from one another.

• homozygous
• heterzygous
• phenotype
• trait

The letters that make-up the genetic code for a trait

• genotype
• heterzygous
• phenotype
• trait

---- Is the combination of two alleles that are the same

• genotype
• homozygous
• phenotype
• trait

----is the type of gene that always shows itself when present

• genotype
• homozygous
• phenotype
• dominant

The physical appearance of the allele combination the offspring receives

• genotype
• homozygous
• phenotype
• dominant

Black fur (B) is dominant. Find the probability of a black offspring in a cross: bb x bb. 

• 0%
• 25%
• 50%
• 100%

Look at the Punnett Square. What's the probability of having the recessive offspring?

• 100%
• 75%
• 50%
• 25%

What are the parents' genotypes?

• Homozygous for brown eyes
• Heterozygous for brown eyes
• Homozygous for blue eyes
• Heterozygous for blue eyes

A type of gene that can be hidden if the dominant allele is present is called

• genotype

• recessive

• dominant

• allele

A section of the DNA strand that determines a specific trait

• gene
• trait
• chromosome
• allele