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inheritance
| Question | Answer |
|---|---|
| Allele | different versions of a gene at a given locus |
| Non-disjunction | of sex chromosomes in males produces sperm that have two sex chromosomes (xx,yy or yx) or that have no sex chromosomes at all (0) |
| Gene linkage | Inheritance of genes as a group because they are on the same chromosome |
| Sex linkage | genes that are found on one sex chromosome but not on the other |
| Trisomy | A genetic condition of having three chromosomes instead of two. The condition causes various birth defects |
| Trisomy 21 | a congenital disorder caused by having an extra 21st chromosome |
| Heterozygous | having two different alleles for a trait |
| Recessive | The allele that is expressed only in homozygous and is completly masked in heterozygotes |
| Autosome | all animals have one pair of sex chromosome and a variable numbers of other chromosome, the other 22 chromosomes found in both sexes |
| Homozygous | carrying two copy of the same allele of a given gene |
| Locus | genes physical location of the chromosome |
| cross-fertilization | when a sperm from one organism fertilizes eggs from a different organism |
| coedominance | the pattern of inheritance when heterozygotes express phenotypes of both of the homozygotes |
| incomplete dominance | the pattern of a heterozygous phenotype si intermediate between the two homozygous phenotypes |