ANSC 4395 Exam 2
Study online at https://quizlet.com/_2ec3qv
1. Gene basic unit of inheritance
segments of dna
relatively short segments of chromosomes
2. Chromosomes 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
3. Homologs pair of chromosomes having corresponding loci
4. Locus the specific location of a gene on a chromosome
5. Allele an alternate form of a gene
6. Multiple alleles more than two possible alleles at a locus
7. Genotype the combination of genes at a particular locus
8. Homozygous a one-locus genotype containing functionally identical genes
9. Heterozygous a lone-locus genotype containing functionally different genes
10. Law of Segrega- Mendel's First Law
tion in the formation of a germ cell or gamete, the two genes at a locus in the parent
cell are separated, only one gene being incorporated into each germ cell
11. Germ cell con- half the # of chromosomes and half the # of genes as normal body cells
tain...
12. Law of Indepen- Mendel's Second Law
dent Assortment genes assort independently during meiosis if all possible gametes are formed in
equal proportions
13. Linkage the occurrence of two or more loci of interest on the same chromosome
1/8
, ANSC 4395 Exam 2
Study online at https://quizlet.com/_2ec3qv
14. Crossing Over a reciprocal exchange of chromosome segments between homologs
occurs prior to the time chromosomes are separated to form gametes during
Meiosis
15. Recombination the formation of a new combination of genes on a chromosome as a result of
crossing over
16. Gamete Selection the process that determines which egg matures and which sperm succeeds in
fertilizing the egg
17. Punnett Square two dimensional grid
along the top are the possible gametes from on parent and along the left side
are the possible gametes from the other parent
inside the grid are the zygotes that are possible
18. Mendelian Sam- the random sampling of parental genes caused by segregation and independent
pling assortment of genes during germ cell formation and by random selection of
gametes in the formation of the embryo
19. Dominance an interaction between two genes at a single locus such that in heterozygotes one
allele has more effect
20. Four types of complete dominance
dominance partial dominance
no or co-dominance
over dominance
21. Complete domi- a form of dominance in which the expression of the heterozygote is identical to
nance the expression of the homozygous dominant genotype
22. Co-dominance a form of dominance in which the expression of the heterozygote is exactly
midway between the expressions of the homozygous genotype
23.
2/8
Study online at https://quizlet.com/_2ec3qv
1. Gene basic unit of inheritance
segments of dna
relatively short segments of chromosomes
2. Chromosomes 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
3. Homologs pair of chromosomes having corresponding loci
4. Locus the specific location of a gene on a chromosome
5. Allele an alternate form of a gene
6. Multiple alleles more than two possible alleles at a locus
7. Genotype the combination of genes at a particular locus
8. Homozygous a one-locus genotype containing functionally identical genes
9. Heterozygous a lone-locus genotype containing functionally different genes
10. Law of Segrega- Mendel's First Law
tion in the formation of a germ cell or gamete, the two genes at a locus in the parent
cell are separated, only one gene being incorporated into each germ cell
11. Germ cell con- half the # of chromosomes and half the # of genes as normal body cells
tain...
12. Law of Indepen- Mendel's Second Law
dent Assortment genes assort independently during meiosis if all possible gametes are formed in
equal proportions
13. Linkage the occurrence of two or more loci of interest on the same chromosome
1/8
, ANSC 4395 Exam 2
Study online at https://quizlet.com/_2ec3qv
14. Crossing Over a reciprocal exchange of chromosome segments between homologs
occurs prior to the time chromosomes are separated to form gametes during
Meiosis
15. Recombination the formation of a new combination of genes on a chromosome as a result of
crossing over
16. Gamete Selection the process that determines which egg matures and which sperm succeeds in
fertilizing the egg
17. Punnett Square two dimensional grid
along the top are the possible gametes from on parent and along the left side
are the possible gametes from the other parent
inside the grid are the zygotes that are possible
18. Mendelian Sam- the random sampling of parental genes caused by segregation and independent
pling assortment of genes during germ cell formation and by random selection of
gametes in the formation of the embryo
19. Dominance an interaction between two genes at a single locus such that in heterozygotes one
allele has more effect
20. Four types of complete dominance
dominance partial dominance
no or co-dominance
over dominance
21. Complete domi- a form of dominance in which the expression of the heterozygote is identical to
nance the expression of the homozygous dominant genotype
22. Co-dominance a form of dominance in which the expression of the heterozygote is exactly
midway between the expressions of the homozygous genotype
23.
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