identical twin
Same-egg sibling
An identical twin is one of two offspring produced when a single fertilized egg splits into two embryos, resulting in individuals who share the same genetic makeup.
Identical twins are always the same sex and typically look remarkably alike: Even their mother sometimes confused the identical twins.
The technical term is monozygotic twin.
From one fertilized egg
- DNAHereditary code molecule
- zygoteFirst embryonic cell
- chromosomesGene-bearing nuclear structures
- genotypeOrganism's complete allele set
alleles · genome · heritability · genetic · replication · mutation · inheritance · congenital
One who closely resembles another
- mirror imageReversed visual duplicate
- spitting imageExact likeness of another
- dead ringerExact duplicate in appearance
- doubleTwice the amount
indistinguishable · matching · doppelganger · carbon copy · likeness · reflection · symmetry · uncanny
Male with shared parents
- sisterFemale sibling
- tripletsThree born together
- quadrupletsFour simultaneous births
- siblingsFellow offspring
family · kinship · birth · womb · fraternal · birth order · multiple birth
Distinguishing one from many
- separationState of being apart
- comparisonAssessment of similarities
- rivalryOngoing contest between opponents
- closenessState of proximity
telepathy · shared experience · attachment · co-dependency · uniqueness · mirroring · self-concept · developmental
Debate over innate versus acquired traits
- concordanceAlphabetical word index
- control groupUntreated subjects for comparison
- heritabilityGenetic share of variation
- epigeneticsHeritable expression changes, sequence intact
discordance · longitudinal · behavioral genetics · environmental factors · scientific
monozygotic
From one fertilized egg
- DNAHereditary code molecule
- zygoteFirst embryonic cell
- chromosomesGene-bearing nuclear structures
genotype · alleles · genome · heritability · genetic · replication · mutation · inheritance · congenital · biological
lookalike
One who closely resembles another
- mirror imageReversed visual duplicate
- spitting imageExact likeness of another
- dead ringerExact duplicate in appearance
double · indistinguishable · matching · doppelganger · carbon copy · likeness · reflection · symmetry · uncanny · duplicate
brother
Male with shared parents
- sisterFemale sibling
- tripletsThree born together
- quadrupletsFour simultaneous births
siblings · family · kinship · birth · womb · fraternal · birth order · multiple birth
individuation
Distinguishing one from many
- separationState of being apart
- comparisonAssessment of similarities
- rivalryOngoing contest between opponents
closeness · telepathy · shared experience · attachment · co-dependency · uniqueness · mirroring · self-concept · developmental · personality
nature versus nurture
Debate over innate versus acquired traits
- concordanceAlphabetical word index
- control groupUntreated subjects for comparison
- heritabilityGenetic share of variation
epigenetics · discordance · longitudinal · behavioral genetics · environmental factors · scientific
- Cloningclone, human cloning, gene cloning, reproductive cloning, animal cloning
- kinshipmother, father, sister, brother, children
- doublesdouble, doubles, duplicate, duplicates, copy
- siblingsbrother, sister, siblings, brothers, sisters
- familymother, father, parents, siblings, parent
- Brothersbro, half brothers, brother-in-law, stepbrothers, half-brother
identical twinfraternal twin
Sibling sharing birth, not genetics
singleton · one of a kind · only child · original · half-sibling
twin, identity, identify, twins, identical, identified, identification, identifying, identities