Mitosis, Meiosis, And Patterns Of Inheritance Worksheet Page 24
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27VII. DIHYBRID CROSSES:
34.
Write the possible allele combinations that would be found in the gametes (sex cells) of parents with the
following genotypes. Remember--each gamete is monoploid. That means that gamete has one allele from each
pair of alleles in the parent’s genotype and half the total number of alleles in the parents’ genotypes. A gamete
can never have both alleles from a given pair.
GENOTYPES
ALL POSSIBLE GAMETES
A.
AaBb
B.
AABb
C.
aaBb
D.
AAbb
E.
AaBB
35.
In a certain plant, red fruit is dominant to yellow fruit, and tall is dominant to short.
a.
Write the genotype of a parent that is homozygous for both red fruit and tall. ______________
b.
Write the genotype of a parent that is heterozygous for both red fruit and tall. ______________
c.
Complete a Punnett Square using the above two genotypes as the parents in the cross.
What is the genotypic ratio of the offspring? What is the phenotypic ratio?
36.
In a selected plant, blue flowers are dominant over purple flowers and long stems are dominant over short
stems. What is the phenotypic ratio for a cross between two plants that are heterozygous for both traits
(flower color and stem length?)
24
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