Two guppies are crossed and produce 50% of their offspring
with the dominant phenotype and 50% of the recessive
phenotype. What are the genotypes of the parents?
25% (C)
In pea plants, purple is dominant to white flower color. A
homozygous dominant breeding purple and homozygous
dominant breeding white plant are crossed. What percent of
their offspring will be purple?
Aa x aa
Two individuals, both hybrid for dimples (a dominant trait), are
crossed. What is the genotypic ratio of their offspring? (A)
Two individuals, both hybrid for dimples (a dominant trait), are
crossed. What is the phenotypic ratio of their offspring? (A)
1:2:1 (A)
In jaguars, spots is dominant to no spots. Two jaguars are
crossed for many generations. Over time, they have 9 offspring
with spots and 10 offspring without spots. What is the
phenotypic ratio of the offspring? (A)
3:1 (A)
Two individuals, both hybrid for dimples (a dominant trait), are
crossed. What is the probability of their offspring being
homozygous for dimples?
1:1 (A)
If two individuals are crossed and 100% of their offspring have
the recessive phenotype, what are the genotypes of the
parents?
25%
625 green pea plants and 213 yellow pea plants are produced in a season from
two green parent pea plants. What is the phenotypic ratio of these offspring? (B)
aa x aa
Red hair is a recessive trait in humans. If a red haired person is crossed with a
brown haired person and they have 10 children all with brown hair, what is the
genotype of the brown haired parent?
3:1 (B)
A homozygous dominant brown mouse is crossed with a heterozygous brown
mouse (tan is the recessive color). (B)
Homozygous
Dominant
In fruit flies, red eye color (R) is a sex-linked trait that is dominant over white eye
color (r). According to the Punnett square, what percentage of female offspring
will have red eyes? (A)
100 %
brown (B)
In pea plants, purple is dominant to white flower color. A true (homozygous)
breeding purple and true breeding white plant are crossed. What percent of
their offspring will be white?
100% (A)
1259 orange goldfish and 416 white goldfish are produced in an F1 generation.
What is the phenotypic ratio? (C)
0%
In fire ants, a red body color is dominant over a gray body color. In an f1
generation of fire ants, there are 358 red colored ants and 347 grey colored ants.
What percent of the offspring are heterozygous?
3:1 (c)
In plants tall is dominant to short. Cross one homozygous dominant plant with
one heterozygous plant. What is the genotypic ratio of tall to short? (C)
50%
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue
eyed?(C)
2:2 (C)