Dihybrid Cross Practice
Quiz by Shelby Reagan
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- Q1
In fruit flies the presence of wings (W) is dominant to the absence of wings (w), and red eyes (R) aredominant to brown eyes (r). A wingless fly that is heterozygous for eye color is crossed with a fly that isheterozygous for wings and has brown eyes. What is the probability that the offspring would behomozygous recessive for wings and eye color?
25%
75%
100%
50%
30sBIOL.6f - Q2
In tomatoes, red fruit (R) is dominant to yellow fruit (r), and tall plants (T) are dominant to short plants(t). What percentage of the offspring from a RRTT X rrtt cross are expected to be RrTt?
75%
50%
25%
100%
30sBIOL.6f - Q3
Being right-handed (R) is dominant over being left-handed(r), and having freckles (F) is dominant over not having freckles (f). Two parents are both heterozygous for both traits. Using the completed Punnett Square above, what probability of offspring(s) are right-handed with freckles?
9/16
1/16
3/16
4/16
30sBIOL.6f - Q4
Two traits in ducks-beak size and leg color. G, the allele for giant beak size, is dominant to g, the allele for a small beak. Y, the allele for yellow legs is dominant to y, the gene for blue legs. Two ducks, that are both heterozygous for both traits cross. What will be the phenotypic ratio?
3:1:3:1
4:4:4:4
9:3:3:1
6:2:2:6
30sBIOL.6f - Q5
. In watermelons, the allele for solid green color (G) is dominant over the allele for striped pattern (g). Short shape(S) is dominant over long shape (s). A cross is made between a watermelon that is homozygous for green color and short shape and watermelon that has a striped pattern and long shape. What is the genotype of each parent?
GGSS and ggss
GgSs and ggss
GgSs and GgSs
GGSS and Ggss
30sBIOL.6f - Q6
In pea plants, green pods (G) are dominant to yellow pods (g), and tall plants (T) are dominant to short plants (t). What fraction of offspring from a GGTT x GgTt cross are expected to be GGTt?
1 out of 16
8 out of 16
4 out of 16
16 out of 16
30sBIOL.6f - Q7
Two fruit flies, heterozygous for red eye color (Rr) and yellow body color (Yy), are crossed. What is the probability the offspring will be homozygous recessive for eye color and body color?
4/16
1/16
8/16
0/16
30sBIOL.6f - Q8
Which statement represents dihybrid crosses?
Dihybrid crosses represent one trait from three different parents.
Dihybrid crosses explain how traits are inherited independently of other traits.
Dihybrid crosses are two genes from two different parents.
Dihybrid crosses represent two traits from parent organisms.
30sBIOL.6f - Q9
Two guinea pigs that are heterozygous for brown fur (Bb) and short fur (Ss) are crossed. What is the probability the offspring will be homozygous dominant for fur color and fur length?
1/4
1/8
1/16
1/2
30sBIOL.6f - Q10
In guinea pigs, the allele for short hair (S) is dominant over the allele for long Hair (s). The allele for black hair (B)is dominant over the allele for brown hair (b). A cross is made between two guinea pigs which are both heterozygous for short, black hair. How many of the offspring will have long black hair?
3
9
1
2
30sBIOL.6f - Q11
In pea plants, yellow seed color (Y) is dominant to green seed color (y), and rounded seeds (R) are dominant to dented seeds (r). A pea plant that produces green seeds and dented is crossed with a pea plant that is heterozygous for seed color and seed shape. What will be the phenotypic ratio?
4:4:4:4
9:3:3:1
1:2:1:2
6:2:2:6
30sBIOL.6f
