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WorksheetsSimple Genetics and Basic Punnett Squares
Total questions: 15
Worksheet time: 8mins
Which genotype is heterozygous for a single gene with alleles T (dominant) and t (recessive)?
Tt
tt
TT
tT
Purple flowers are dominant to white. What phenotype results from genotype Pp?
No flowers
White flowers
Purple flowers
Mixed color
Round seeds (R) are dominant to wrinkled seeds (r). Match each genotype to its phenotype.
RR
Round seeds
Rr
Round seeds
rr
Wrinkled seeds
Pointed heads (P) are dominant to round heads (p). Which genotype set lists all individuals that would show pointed heads?
Pp and pp
PP and Pp
PP only
pp only
Brown eyes (B) are dominant to blue (b). Which genotype is homozygous recessive?
Bb
bb
bB
BB
A heterozygous round-seeded plant (Rr) is crossed with a homozygous round-seeded plant (RR). What percentage of offspring will be homozygous (RR)?
25% of offspring
50% of offspring
75% of offspring
100% of offspring
In pea plants, purple flowers (P) are dominant to white flowers (p). If two white-flowered plants are crossed, what percentage of their offspring will have white flowers?
50 percent of the offspring
25 percent of the offspring
0 percent of the offspring
100 percent of the offspring
A white-flowered pea plant (pp) is crossed with a plant that is heterozygous for purple flowers (Pp). What percentage of the offspring will have purple flowers?
0 percent will be purple
25 percent will be purple
50 percent will be purple
100 percent will be purple
Two pea plants, both heterozygous for flower color (Pp × Pp), are crossed. What percentage of their offspring will have purple flowers?
75 percent purple flowers
50 percent purple flowers
100 percent purple flowers
25 percent purple flowers
Two pea plants, both heterozygous for flower color (Pp × Pp), are crossed. What percentage of their offspring will have white flowers?
25 percent white flowers
50 percent white flowers
75 percent white flowers
100 percent white flowers
In guinea pigs, short hair (S) is dominant to long hair (s). What genotype would a pure-breeding short-haired guinea pig have?
Ss genotype for hair
SS genotype for hair
ss genotype for hair
sS genotype for hair
In guinea pigs, short hair (S) is dominant to long hair (s). What genotype would a long-haired guinea pig have?
sS genotype for hair
ss genotype for hair
Ss genotype for hair
SS genotype for hair
Show the expected outcome for a cross between a pure-breeding short-haired guinea pig (SS) and a long-haired guinea pig (ss). What percentage of the offspring will have short hair?
100 percent short-haired offspring
0 percent short-haired offspring
50 percent short-haired offspring
25 percent short-haired offspring
Two heterozygous guinea pigs (Ss × Ss) are crossed. What percentage of the offspring will have short hair?
25 percent short-haired offspring
50 percent short-haired offspring
75 percent short-haired offspring
100 percent short-haired offspring
Two heterozygous guinea pigs (Ss × Ss) are crossed. What percentage of the offspring will have long hair?
50 percent long-haired offspring
100 percent long-haired offspring
25 percent long-haired offspring
75 percent long-haired offspring
