Answer Key
Section 6.5
Study Guide
1. parent’s alleles/genotype
2. parent’s alleles/genotype
3. possible genotypes of
offspring
4. because the alleles
segregated during gamete
formation (meiosis)
when the homologous
chromosomes separated
5. a comparison that tells the
proportion of offspring that
have a particular genotype;
a comparison that tells the
proportion of offspring that
have a particular phenotype
6. 1:2:1
7. 3:1
Copyright by McDougal Littell, a division of Houghton Mifflin Company
8. a cross that examines the
inheritance of two different
traits
9. Figure 6.17 represents a
dihybrid cross. Each parent
organism has two alleles for
both traits, which makes a
total of four alleles.
10. AB, Ab
11. 9:3:3:1
12. average, exact
13. multiply
14. one-fourth
15. a cross between an
organism with the recessive
phenotype and an organism
with an unknown genotype
16. Allele pairs are
independent. They separate
independently of each other
during gamete formation
(meiosis).
Answer Key
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