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| 616819630 | achondroplasia | a form of human dwarfism caused by a single dominant allele | 0 | |
| 709265294 | alleles | an alternative version of a gene | 1 | |
| 570920662 | amniocentesis | a technique for diagnosing genetic defects while a fetus is in the uterus | 2 | |
| 11246227 | carrier | individual who is heterozygous for a recessively inherited disorder and who therefore does not show symptoms of that disorder but who may pass on the recessive allele to offspring | 3 | |
| 126943020 | character | heritable feature that varies among individuals within a population | 4 | |
| 570920663 | chorionic villus sampling | a technique for diagnosing genetic defects while the fetus is in an early development stage within the uterus | 5 | |
| 464965098 | codominant | inheritance pattern in which a heterozygous expresses the distinct trait of both alleles | 6 | |
| 570920664 | complete dominance | a type of inheritance in which the phenotypes of the heterozygote and dominant homozygote are indistinguishable | 7 | |
| 191873991 | cross | mating of two sexually reproducing individuals | 8 | |
| 740744577 | cross-fertilization | the fusion of sperm and egg derived from two different individuals | 9 | |
| 616819629 | cystic fibrosis | a genetic disease that occurs in people with two copies of a certain recessive allele characterized by excessive secretion of mucus and vulnerability to infection | 10 | |
| 284923419 | dihybrid cross | an experimental mating of individuals differing at two genetic loci | 11 | |
| 934881970 | dominant allele | the allele that determines the phenotype of a gene when the individual is heterozygous for that gene | 12 | |
| 808823150 | Duchenne muscular dystrophy | human genetic disease caused by sex-linked recessive allele characterized by progressive weakening and loss of muscle tissue | 13 | |
| 962431516 | F1 generation | the offspring of two parental individuals | 14 | |
| 962431517 | F2 generation | the offspring of the F1 generation | 15 | |
| 340050212 | genetics | the science of heredity | 16 | |
| 391110492 | genotype | the genetic makeup of an organism | 17 | |
| 229948486 | hemophilia | a human genetic disease caused by a sex-linked recessive allele characterized by excessive bleeding following an injury | 18 | |
| 709265298 | heterozygous | having two different alleles for a given gene | 19 | |
| 709265297 | homozygous | having two identical alleles for a given gene | 20 | |
| 172917000 | Huntington's disease | a human genetic disease | 21 | |
| 962431154 | hybrids | offspring of parents of two different species or of two different varieties of one species | 22 | |
| 742560927 | inbreeding | mating between close relatives | 23 | |
| 749037363 | incomplete dominance | type of inheritance in which the phenotype of a heterozygote is intermediate between the phenotypes of the two types of homozygous | 24 | |
| 284923420 | law of independent assortment | general rule in inheritance that when gametes form during meiosis, each pair of alleles for a particular characteristic segregate independently of other pairs | 25 | |
| 463055706 | law of segregation | general rule in inheritance that individuals have two alleles for each gene and that when gametes form by meiosis, the two alleles separate, each resulting gamete ending up with only allele of each gene | 26 | |
| 279083208 | linked genes | genes located near each other on the same chromosome tend to be inherited together | 27 | |
| 291145658 | monohybrid cross | experimental mating of two individuals differing at one genetic locus | 28 | |
| 962431463 | P generation | parent individuals from which offspring are derived in studies of inheritance | 29 | |
| 742560926 | pedigree | family tree representing the occurrence of heritable traits in parents and offspring across a number of generations. | 30 | |
| 391110491 | phenotype | expressed traits of an organism | 31 | |
| 1011128436 | pleiotropy | control of more than one phenotypic characteristic by a single gene | 32 | |
| 279083206 | polygenic inheritance | additive effect of two or more gene loci on a single phenotypic characteristic | 33 | |
| 463055707 | Punnett square | diagram used in the study of inheritance to show the results of random fertilization | 34 | |
| 934882096 | recessive allele | allele that has no noticeable effect on the phenotype of a gene when the indiividual is heterozygous for that gene | 35 | |
| 996045682 | self-fertilize | fusion of sperm and egg produced by the same individual organism | 36 | |
| 229948485 | sex chromosomes | chromosome that determines whether an individual is male or female | 37 | |
| 924954915 | sex-linked gene | gene located on a sex chromosome | 38 | |
| 996045624 | trait | variant of a character found within a population | 39 | |
| 740744578 | true-breeding | organisms for which sexual reproduction produces offspring with inherited traits identical to those of the parents | 40 | |
| 877485510 | ultrasound imaging | technique for examining a fetus in the uterus by the echoing of high-frequency sound waves | 41 |
