punnett square

Homozygous is when...

• the alleles are the same
• the alleles are different
• the alleles are absent
• the alleles are present

Heterozygous is when...

• the alleles are the same
• the alleles are different
• the alleles are absent
• the alleles are present

B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 

• 0%
• 25%
• 50%
• 75%

In the punnett square shown, what must the genotype of the missing parent be?

• BB
• Bb
• bb
• Tt

A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?

• 0%
• 25%
• 50%
• 75%

Aa, DD, bB, yy are all examples of

• genotypes
• phenotypes

AA and Aa always show up as

• dominant
• recessive

B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.

• they have same phenotype and genotype
• they have different genotypes and phenotypes
• they have same phenotype but different genotypes
• they have same genotype but different phenotypes

Which of the following is homozygous recessive?

• Tt
• tt
• TT
• T

PHENOTYPE is

• the genetic make-up of an organism

• the physical trait of an organism

• nucleic acid

• Aa