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Fraternal twins
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Fraternal twins Born at the same time but resulting from the fertilization of two different eggs, fraternal twins are no more genetically similar than siblings; identical twins result from the division of one fertilized egg and are genetically identical.
RELATED TERMS--------------------------------------
Fertilization
The combining of the genetic material carried by sperm and egg to create an embryo. Normally occurs inside the fallopian tube (in vivo) but may also occur in a petri dish (in vitro).
SIMILAR TERMS--------------------------------------
Fraternal twin
A twin who have shared a common uterine environment with its sibling. Fraternal twins are due to the fertilization of two different ova by different sperm. Fraternal twins are also called dizygotic twins.
PREVIOUS AND NEXT TERMS--------------------------------------
Follicles
Each month several of these small egg-containing cavities develop on the ovary of an ovulating woman. Each cavity contains a single immature egg; ovulation occurs when a follicle (or sometimes more than one) ruptures and releases an egg.
Fontanel
The soft spots on a baby's head that, during birth, enable the soft bony plates of the skull to flex, allowing the head to pass through the birth canal. Fontanels are completely hardened by a child's second birthday.
Forceps delivery
A delivery in which a hinged, tonglike device (called a forceps) is used to pull out a baby's head.
Foreskin
The flap of skin that normally covers the head of the penis; it is removed when a baby is circumcised.
Formula
An alternative to breast milk, baby formula is usually milk-based but is also made from soy products.
Fraternal twins
Full-term
A baby born between 38 and 42 weeks' gestation.
Fundal height
The distance between the top of a pregnant woman's uterus (called thefundus) to her pubic bone. Measured to determine fetal age.
Feature binding
The binding of features processed by different systems (audio, visual) or of different subsystems (motion, depth, color) to create a unified conscious percept.
Feature matching
In Binocular Vision and Stereopsis, disparity can be extracted from an image if features in the two corresponding binocular images are matchable e.g. lines to lines, dots to dots.
Fechner's Paradox
The fact that a monocular view may look brighter than a binocular view. Suppose that a scene is viewed through both eyes but that one eye sees it through a neutral filter that attenuates all wavelengths by a constant ratio. The filter does not distort the reflectances or ratios of light reaching the eye, but only its absolute intensity. If the filtered eye is entirely occluded the scene looks brighter and more vivid than with the filter despite the fact that less total light is reaching the two eyes and the reflectances are still the same.
RELATED TERMS--------------------------------------
Fertilization
The combining of the genetic material carried by sperm and egg to create an embryo. Normally occurs inside the fallopian tube (in vivo) but may also occur in a petri dish (in vitro).
SIMILAR TERMS--------------------------------------
Fraternal twin
A twin who have shared a common uterine environment with its sibling. Fraternal twins are due to the fertilization of two different ova by different sperm. Fraternal twins are also called dizygotic twins.
PREVIOUS AND NEXT TERMS--------------------------------------
Follicles
Each month several of these small egg-containing cavities develop on the ovary of an ovulating woman. Each cavity contains a single immature egg; ovulation occurs when a follicle (or sometimes more than one) ruptures and releases an egg.
Fontanel
The soft spots on a baby's head that, during birth, enable the soft bony plates of the skull to flex, allowing the head to pass through the birth canal. Fontanels are completely hardened by a child's second birthday.
Forceps delivery
A delivery in which a hinged, tonglike device (called a forceps) is used to pull out a baby's head.
Foreskin
The flap of skin that normally covers the head of the penis; it is removed when a baby is circumcised.
Formula
An alternative to breast milk, baby formula is usually milk-based but is also made from soy products.
Fraternal twins
Full-term
A baby born between 38 and 42 weeks' gestation.
Fundal height
The distance between the top of a pregnant woman's uterus (called thefundus) to her pubic bone. Measured to determine fetal age.
Feature binding
The binding of features processed by different systems (audio, visual) or of different subsystems (motion, depth, color) to create a unified conscious percept.
Feature matching
In Binocular Vision and Stereopsis, disparity can be extracted from an image if features in the two corresponding binocular images are matchable e.g. lines to lines, dots to dots.
Fechner's Paradox
The fact that a monocular view may look brighter than a binocular view. Suppose that a scene is viewed through both eyes but that one eye sees it through a neutral filter that attenuates all wavelengths by a constant ratio. The filter does not distort the reflectances or ratios of light reaching the eye, but only its absolute intensity. If the filtered eye is entirely occluded the scene looks brighter and more vivid than with the filter despite the fact that less total light is reaching the two eyes and the reflectances are still the same.
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This dictionary contains 19186 terms.
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