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Exercício de Gêmeos

por Carolina () Normal Monday, August 25th, 2008

Exercício:

Os casos de nascimento de gêmeos, na espécie humana, envolvem duas situações
diferentes; na primeira, os gêmeos são referidos como univitelinos e, na segunda, como
bivitelinos. Com relação aos gêmeos, é correto afirmar que:
 
01. os gêmeos univitelinos são resultantes da bipartição do óvulo, cujas células resultantes
são fecundadas por dois espermatozóides distintos.
02. os gêmeos bivitelinos são resultantes da fecundação de dois óvulos por dois
espermatozóides e são sempre de sexos diferentes.
04. os gêmeos univitelinos são resultantes da fecundação de um único óvulo por um único
espermatozóide, resultando sempre indivíduos do mesmo sexo.
08. os gêmeos bivitelinos são resultantes da bipartição de 1 óvulo cujas células resultantes
são fecundadas por um único espermatozóide.
16. os gêmeos bivitelinos são resultantes da fecundação de dois óvulos por dois
espermatozóides, podendo resultar em indivíduos do mesmo sexo ou de sexos diferentes.

Informações Adicionais:


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