BRAINSCAPE1
BIOL 2100 Exam 3 Exam with complete solutions
latest version
1. hybridization: Breeding technique that involves crossing two true breeding varieties
2. true-breeding: term used to describe organisms that produce ottspring identical to themselves if allowed to
self-pollinate
3. Law of Segregation: Mendelian law stating that two alleles for each trait separate during meiosis. the two
alleles for a heritable character segregate (separate from each other) during gamete formation and end up in ditterent
gametes. Thus, an egg or a sperm gets only one of the two alleles that are present in the somatic cells of the organism.
4. What was the phenotypic ratio that Gregor Mendel consistently obtained in
the second generation of pea seeds?: 3:1
5. Alleles: ditterent versions of a gene
6. What was the genotypic ratio that Gregor Mendel consistently obtained in the
second generation of pea seeds?: 1:2:1 (PP, 2Pp, pp)
7. Phenotype vs. Genotype: Phenotype: expressed physical traits
Genotype: Genetic make-up
8. Law of Independent Assortment: genes for ditterent traits segregate independently during the
formation of gametes.
9. What is a key difference between segregation and indep. assortment?: indep.
assortment involves two genes
10. testcross: cross between an organism with an unknown genotype and an organism with a homozygous
recessive phenotype
11. What is a testcross used for?: To determine if an organism has a Pp or PP genotype
12. dihybrid: heterozygous for two genes
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13. When is the 9:3:3:1 phenotypic ratio expected?: independent assortment for two genes
14. complete dominance: a relationship in which one allele is completely dominant over another
15. In what situation are the phenotypes of the heterozygote and the dominant
homozygote indistinguishable?: complete dominance
16. incomplete dominance: Situation in which one allele is not completely dominant over
BRAINSCAPE1
BIOL 2100 Exam 3 Exam with complete solutions
latest version
1. hybridization: Breeding technique that involves crossing two true breeding varieties
2. true-breeding: term used to describe organisms that produce ottspring identical to themselves if allowed to
self-pollinate
3. Law of Segregation: Mendelian law stating that two alleles for each trait separate during meiosis. the two
alleles for a heritable character segregate (separate from each other) during gamete formation and end up in ditterent
gametes. Thus, an egg or a sperm gets only one of the two alleles that are present in the somatic cells of the organism.
4. What was the phenotypic ratio that Gregor Mendel consistently obtained in
the second generation of pea seeds?: 3:1
5. Alleles: ditterent versions of a gene
6. What was the genotypic ratio that Gregor Mendel consistently obtained in the
second generation of pea seeds?: 1:2:1 (PP, 2Pp, pp)
7. Phenotype vs. Genotype: Phenotype: expressed physical traits
Genotype: Genetic make-up
8. Law of Independent Assortment: genes for ditterent traits segregate independently during the
formation of gametes.
9. What is a key difference between segregation and indep. assortment?: indep.
assortment involves two genes
10. testcross: cross between an organism with an unknown genotype and an organism with a homozygous
recessive phenotype
11. What is a testcross used for?: To determine if an organism has a Pp or PP genotype
12. dihybrid: heterozygous for two genes
BRAINSCAPE1
, BRAINSCAPE1
13. When is the 9:3:3:1 phenotypic ratio expected?: independent assortment for two genes
14. complete dominance: a relationship in which one allele is completely dominant over another
15. In what situation are the phenotypes of the heterozygote and the dominant
homozygote indistinguishable?: complete dominance
16. incomplete dominance: Situation in which one allele is not completely dominant over
BRAINSCAPE1
