Genetics Review I

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

• homozygous
• 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 is called

• genotype
• recessive
• dominant
• allele

A section of the DNA strand that determines a specific trait

• gene
• trait
• chromosome
• allele

Tallness is dominant in pea plants and is represented by "T." What would the genotype be for a homozygous tall plant?

• Tt
• tt
• TT
• Tall