Simple Genetics Practice Problems
Simple Genetics Practice Problems
1. For each genotype, indicate whether it is heterozygous (HE), homozygous dominant (HD) or homozygous recessive (HR)
|AA ____ |Ee ____ |Ii ____ |Mm ____ |
|Bb ____ |ff ____ |Jj ____ |nn ____ |
|Cc ____ |GG ____ |kk ____ |OO ____ |
|Dd ____ |HH ____ |Ll ____ |Pp |
2. For each of the genotypes below, determine the phenotype.
|Purple flowers are dominant to white flowers |Brown eyes are dominant to blue eyes |
|PP ___________________________ |BB ___________________________ |
|Pp ___________________________ |Bb ___________________________ |
|pp ___________________________ |bb ___________________________ |
|Round seeds are dominant to wrinkled |Bobtails are recessive (long tails dominant) |
|RR ___________________________ |TT ___________________________ |
|Rr ___________________________ |Tt ___________________________ |
|rr ___________________________ |tt ___________________________ |
3. For each phenotype, list the genotypes. (Remember to use the letter of the dominant trait)
|Straight hair is dominant to curly. |Pointed heads are dominant to round heads. |
|____________ straight |____________ pointed |
|____________ straight |____________ pointed |
|____________ curly |____________ round |
4. The trait being studied is round seeds (dominant) and wrinkled seeds (recessive). In the table, provide the genotypes and phenotypes of the possible offspring from these two heterozygous parents.
|Genotype |Phenotype |
|1. | |
|2. | |
|3. | |
|4. | |
R r
R
r
5. In guinea pigs, the allele for short hair is dominant to the allele for long hair. Show a cross between a homozygous dominant parent and a heterozygous parent.
|Genotype |Phenotype |
|1. | |
|2. | |
|3. | |
|4. | |
S s
S
S
6. In humans, the allele for brown eyes is dominant to the allele for blue eyes. Show a cross between a homozygous dominant parent and homozygous recessive parent.
|Genotype |Phenotype |
|1. | |
|2. | |
|3. | |
|4. | |
7. Straight hair is dominant to curly hair. Show the cross between 2 heterozygous parents. What percentage of the offspring will have curly hair? What percentage of the offspring will be heterozygous?
-----------------------
rr
Rr
Rr
RR
................
................
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