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chapter 12 terms
| Question | Answer |
|---|---|
| sex chromosome | one of the pair of chromosomes that determine the sex of an individual |
| autosome | any chromosome that is not a sex chromosome |
| sex-linked trait | a trait that is determined by a gene found on one of the sex chromosomes, such as the X chromosome or the Y chromosome in humans |
| linked genes | pairs of genes that tend to be inherited together |
| chromosome map | a diagram of gene positions on a chromosome |
| map unit | a frequency of crossing-over of 1%. |
| Germ cell mutations | a mutation of a sex cell that can not effect the organism. |
| somatic cell mutation | a mutation of a somatic cell that can effect the organism. |
| lethal mutations | a cell mutation that can cause death, often before birth. |
| deletion | loss of a piece of chromosome due to breakage. |
| inversion | a piece of a chromosome breaks off, flips around, and re-attaches. |
| translocation | a piece of a chromosome breaks off and reattaches to a nonhomologous chromosome. |
| nondisjunction | a chromsome fails to separate from ist homologue during meiosis. |
| point mutation | a mutation in which only one nucleotide or nitrogenous base in a gene is changed |
| substitution | mutation in which a nucleotide or a codon in DNA is replaced with a different nucleotide |
| framshift mutation | a mutation, such as the insertion or deletion of a nucleotide in a coding sequence, that results in the misreading of the code during translation because of a change in the reading frame |
| insertion mutation | one or more nucleotides are added to a gene |
| pedigree | a diagram that shows the occurrence of a genetic trait in several generations of a family |
| carrier | in biology, an individual who has one copy of a recessive autosomal allele that causes disease in the homozygous condition |
| genetic disorder | an inherited disease or disorder that is caused by a mutation in a gene or by a chromosomal defect |
| polygenic trait | a characteristic of an organism that is determined by many genes |
| complex characters | characters that are strongly affected by both the environment and genetics |
| multiple alleles | more than two alleles (versions of the gene) for a genetic trait |
| codominance | a condition in which both alleles for a gene are fully expressed |
| incomplete dominance | a condition in which a trait in an individual is intermediate between the phenotype of the individual's two parents because the dominant allele is unable to express itself fully |
| sex-influenced traits | an autosomal trait that is influenced by the presence of male or female sex hormones |
| Huntington's disease | a rare hereditary disease of the brain characterized by involuntary movements of the limbs or face, decreasing mental abilities, and eventual death |
| amniocentesis | a procedure used in fetal diagnosis in which amniotic fluid is removed from the uterus of the pregnant woman |
| chorionic villi sampling | a procedure in which the chorionic villi to are analyzed to diagnose fetal genotypes |
| geneti counseling | the process of testing and informing potential parents about their genetic makeup and the likelihood that they will have offspring with genetic defects or hereditary diseases |
| gene therapy | a technique that places a gene into a cell to correct a hereditary disease or to improve the genome |
Created by:
harrisa15
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