Inheritance

How many alleles (letters) do each person carry for a trait?

• 1
• 2
• 3
• 4

How many alleles (letters) does a child get from each parent for each trait?

• 1
• 2
• 3
• 4

Aa, DD, bB, yy are all examples of

• genotypes
• phenotypes

Which of the following is a phenotype?

• Aa
• red hair
• heterozygous
• DNA

Which of the following genotypes is homozygous dominant?

• A
• Aa
• AA
• aa

Which of the following genotypes is heterozygous?

• Bb
• BB
• bb
• B

Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r  = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds? 

• 0%
• 25%
• 50%
• 100%

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

Smooth seeds are dominant over wrinkled seeds.
What is the genotype ratio for the following cross?
Nn X NN

• NN = 100%, Nn = 0%, nn = 0%
• NN = 50%, Nn = 25%, nn = 25%
• NN = 50%, Nn = 50%, nn = 0%
• NN = 25%, Nn = 50%, nn = 25%

In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short 
b = long
What would the cross be for two heterozygous guinea pigs?

• BB X BB
• BB X Bb
• Bb X Bb
• bb X bb