| front |
back |
revisions |
lasted changed by |
history |
| Linked genes |
predicted to always be transmitted together during gamete formation and should violate the principle of independent assortment
-are inherited together unless crossing over occurs
-segregate together unless there is a physical crossover between homologous chromosomes
- |
0 |
Sehado Sun, 14 Mar 2010 19:53:49 GMT |
 |
| What does crossing over do? |
It breaks up linkage and makes it appear as if independent assortment is occuring |
0 |
Sehado Sun, 14 Mar 2010 19:53:49 GMT |
|
| What determines the frequency of crossing over? |
the physical distance between genes |
0 |
Sehado Sun, 14 Mar 2010 18:51:26 GMT |
|
| genetic map |
diagram that shows the relative positions of genes along a particular chromosome |
0 |
Sehado Sun, 14 Mar 2010 18:51:26 GMT |
|
| linkage |
the physical association of genes that are found on the same chromosome |
0 |
Sehado Sun, 14 Mar 2010 18:51:26 GMT |
|
| autosomes |
non-sex chromosomes |
0 |
Sehado Sun, 14 Mar 2010 18:51:26 GMT |
|
| Translocations & deletions |
portion deleted or transferred to another chromosome |
0 |
Sehado Fri, 12 Mar 2010 05:42:07 GMT |
|
| Non-disjunction |
failure to separate during meiosis |
0 |
Sehado Fri, 12 Mar 2010 05:42:07 GMT |
|
| Genes |
Many (most!) genes have multiple alleles |
0 |
Sehado Fri, 12 Mar 2010 05:42:07 GMT |
|
| what causes abnormalities of chromosome number ? |
It is usually caused by the failure of chromosomes to separate properly in meiosis (“non-disjunction” |
0 |
Sehado Fri, 12 Mar 2010 05:42:07 GMT |
|
| Trisomy 21 |
Down Syndrome |
0 |
Sehado Fri, 12 Mar 2010 05:39:21 GMT |
|
| trisomy |
extra copy of a chromosome |
0 |
Sehado Fri, 12 Mar 2010 05:39:21 GMT |
|
| polyploidy |
Complete extra copy of all chromosomes |
0 |
Sehado Fri, 12 Mar 2010 05:39:21 GMT |
|
| codominance |
both alleles contribute to the phenotype |
0 |
Sehado Fri, 12 Mar 2010 05:39:21 GMT |
|
| Incomplete dominance |
-phenotype determined by “dominant” allele, but dominance is not complete
e.g. snapdragons and human blood |
0 |
Sehado Fri, 12 Mar 2010 05:37:33 GMT |
|
| Polygenetic Inheritance |
when two or possibly three genes determine a trait
e.g Parakeet Feather color |
0 |
Sehado Fri, 12 Mar 2010 05:37:33 GMT |
|
| X and Y Chromosomes |
“Sex” Chromosomes |
0 |
Sehado Fri, 12 Mar 2010 05:37:33 GMT |
|
| Chromosomes 1-22 |
Autosomal” chromosomes |
0 |
Sehado Fri, 12 Mar 2010 05:37:33 GMT |
|
| Crossing over |
-(during meiosis) recombines genes
-distant genes are more likely to be separated by recombination |
0 |
Sehado Fri, 12 Mar 2010 05:24:23 GMT |
|
| ALLELE |
is a particular form of a gene |
0 |
Sehado Fri, 12 Mar 2010 05:24:23 GMT |
|
| Test Cross |
used to determine the genotype of a plant with the dominant phenotype; usually done using a plant with the recessive phenotype. |
0 |
Sehado Fri, 12 Mar 2010 05:24:23 GMT |
|
| dipliod |
Organisms with 2 genes for each trait |
0 |
Sehado Fri, 12 Mar 2010 05:24:23 GMT |
|
