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Bilateral descent is a system of family lineage in which the relatives on the mother's side and father's side are equally important for emotional ties or for transfer of property or wealth. It is a family arrangement where descent and inheritance are passed equally through both parents. [ 1 ]
Bilateria (/ ˌ b aɪ l ə ˈ t ɪər i ə /) [5] is a large clade of animals characterised by bilateral symmetry during embryonic development.This means their body plans are laid around a longitudinal axis with a front (or "head") and a rear (or "tail") end, as well as a left–right–symmetrical belly and back surface.
Bilateral to the urethral fold, genital swellings become prominent. These structures are the future scrotum and labia majora in males and females, respectively. The genital tubercles of an eight-week-old embryo of either sex are identical.
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The term "family values" is often used in political discourse in some countries, its general meaning being that of traditional or cultural values that pertain to the family's structure, function, roles, beliefs, attitudes, and ideals, usually involving the "traditional family"—a middle-class family with a breadwinner father and a homemaker ...
Bilateral branchial cleft sinuses during surgery. Four branchial clefts (also called "grooves") form during the development of a human embryo. The first cleft normally develops into the external auditory canal, [8] but the remaining three arches are obliterated and have no persistent structures in normal development. Persistence or abnormal ...
In anthropology, a lineage is a unilineal descent group that traces its ancestry to a demonstrably shared ancestor, known as the apical ancestor. [1] [2] [3] Lineages are formed through relationships traced either exclusively through the maternal line (matrilineage), paternal line (patrilineage), or some combination of both (). [4]
The bilateral symmetry of bilaterians is a complex trait which develops due to the expression of many genes. The bilateria have two axes of polarity . The first is an anterior – posterior (AP) axis which can be visualised as an imaginary axis running from the head or mouth to the tail or other end of an organism.