ANSC 4395 TEST 2 STUDY GUIDE
2026 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. started with Genes in a Population (p. 91)
In gene and genotypic frequencies, p + q must =
This is always true if there are only 2 possible alleles at a locus. - ANSWER
✔1
2. The relative frequency of a one locus genotype in a population - ANSWER
✔ genotypic frequency
3. Uppercase letters denote genotypic frequency
- P=
- H=
- Q=
4. These = 1 if there is 3 possible genotypes. - ANSWER ✔ P= homozygous
dominant
H= heterozygous
Q= homozygous recessive
5. The relative frequency of an allele in a population; measure of how common
an allele is in relation to other alleles at that locus - ANSWER ✔ gene
frequency
,6. What is the difference in genotype and gene + genotypic frequency? -
ANSWER ✔ genotype describes trait in individual
gene/ genotypic freq. - describes trait in population
7. What factors affect gene and genotypic frequencies? - ANSWER ✔
selection, mutation, migration, genetic drift
8. Define population genetics. - ANSWER ✔ the study of factors affecting
gene and genotypic frequencies in a population
9. The immediate effect of selection is to? - ANSWER ✔ change gene
frequencies (genotypic freq. also change)
10.Selection for a particular allele could result in? - ANSWER ✔ absence of
any other allele at that locus; this allele would be fixed or has reached
fixation
11.Gene - ANSWER ✔ basic unit of inheritance
segments of dna
relatively short segments of chromosomes
12.Chromosomes - ANSWER ✔ long strands of DNA and associated proteins
in the nucleus of the cell
present in pairs- one from sire, one from dam
number of pairs depends on the species
13.Homologs - ANSWER ✔ pair of chromosomes having corresponding loci
, 14.How does randomness of inheritance create problem for animal breeders? -
ANSWER ✔ it can increase probability of superior offspring but no control
over Mendelian sampling of genes which determines genetic makeup of
offspring
15.Offspring are not all the same bc? - ANSWER ✔ they recieve different sets
genes from parents
16.The probabilty of getting superior offspring is better when? - ANSWER ✔
mating superior parents
17.Define dominance - ANSWER ✔ interation between genes at a single locus
18.In _____, dominance explains why we get various phenotypes in specific
proportions when we make specific matings. - ANSWER ✔ simply inherited
traits
19.In ___, dominance is a chief source of hybrid vigor and inbreeding
depression. - ANSWER ✔ polygenic traits
20.Define complete dominance. - ANSWER ✔ the heterozygote is identical to
the expression of the homozygous dominant genotype
21.What are 2 examples of complete dominance? - ANSWER ✔ polled trait in
cattle and color in angus cow
22.Define codominance.
2026 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<RECENT VERSION>
1. started with Genes in a Population (p. 91)
In gene and genotypic frequencies, p + q must =
This is always true if there are only 2 possible alleles at a locus. - ANSWER
✔1
2. The relative frequency of a one locus genotype in a population - ANSWER
✔ genotypic frequency
3. Uppercase letters denote genotypic frequency
- P=
- H=
- Q=
4. These = 1 if there is 3 possible genotypes. - ANSWER ✔ P= homozygous
dominant
H= heterozygous
Q= homozygous recessive
5. The relative frequency of an allele in a population; measure of how common
an allele is in relation to other alleles at that locus - ANSWER ✔ gene
frequency
,6. What is the difference in genotype and gene + genotypic frequency? -
ANSWER ✔ genotype describes trait in individual
gene/ genotypic freq. - describes trait in population
7. What factors affect gene and genotypic frequencies? - ANSWER ✔
selection, mutation, migration, genetic drift
8. Define population genetics. - ANSWER ✔ the study of factors affecting
gene and genotypic frequencies in a population
9. The immediate effect of selection is to? - ANSWER ✔ change gene
frequencies (genotypic freq. also change)
10.Selection for a particular allele could result in? - ANSWER ✔ absence of
any other allele at that locus; this allele would be fixed or has reached
fixation
11.Gene - ANSWER ✔ basic unit of inheritance
segments of dna
relatively short segments of chromosomes
12.Chromosomes - ANSWER ✔ long strands of DNA and associated proteins
in the nucleus of the cell
present in pairs- one from sire, one from dam
number of pairs depends on the species
13.Homologs - ANSWER ✔ pair of chromosomes having corresponding loci
, 14.How does randomness of inheritance create problem for animal breeders? -
ANSWER ✔ it can increase probability of superior offspring but no control
over Mendelian sampling of genes which determines genetic makeup of
offspring
15.Offspring are not all the same bc? - ANSWER ✔ they recieve different sets
genes from parents
16.The probabilty of getting superior offspring is better when? - ANSWER ✔
mating superior parents
17.Define dominance - ANSWER ✔ interation between genes at a single locus
18.In _____, dominance explains why we get various phenotypes in specific
proportions when we make specific matings. - ANSWER ✔ simply inherited
traits
19.In ___, dominance is a chief source of hybrid vigor and inbreeding
depression. - ANSWER ✔ polygenic traits
20.Define complete dominance. - ANSWER ✔ the heterozygote is identical to
the expression of the homozygous dominant genotype
21.What are 2 examples of complete dominance? - ANSWER ✔ polled trait in
cattle and color in angus cow
22.Define codominance.
