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Natalka [10]
3 years ago
10

Which of these materials cannot cross the placenta from mother to fetus?

Biology
2 answers:
r-ruslan [8.4K]3 years ago
8 0

Answer:

its not alcohol. i think it is dna because dna from the mother and father are givin at the time of the sperm fertilizing the egg

lesya692 [45]3 years ago
7 0

Answer:

alcohol is the answer i think

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Which of the following is true of folded mountains, fault-block mountains, and volcanic mountains? (2 points)
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Unregulated cell division can result in _____.
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Unregulated cell division can result in cancer

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En un cruce entre peces naranjas y peces grises se obtiene una generación (f1) de 50% peces grises . Realice el cruce y explique
Ilya [14]

Answer:

Uno de los progenitores es heterocigoto para color naranja (Nn) y el otro parental es homocigoto recesivo para gris (nn). Al haber una cruza entre un homocigoto recesivo y un heterocigoto, la 50% de la progenie expresa color naranja (Nn), mientras que el otro 50% expresa color gris (nn).

Explanation:

<u>Datos disponibles:</u>

  • Cruce entre peces naranjas y peces grises
  • 50% de la F1 son peces grises
  • Naranja dominante sobre gris

Podemos nombrar el alelo dominante para color naranja <em>N</em>, y al alelo recesivo  para color gris <em>n</em>.

Para que en un cruce entre dos fenotipos distintos, el 50% de la primer camada exprese uno de estos fenotipos, entonces uno de los parentales debe ser heterocigoto, mientras que el otro parental debe ser homocigoto recesivo. De esta forma 50% de la primera generación expresara uno de los fenotipos, mientras que el otro 50% expresará el otro fenotipo.

Supongamos que uno de los parentales lleva el genotipo <em>Nn</em>, y el otro parental es <em>nn</em>.

Cruce:

Parental)      Nn    x     nn

Gametas)   N    n       n    n

Fenotipos) Naranja     Gris

Cuadro de Punnett)      N           n

                            n       Nn         nn

                            n       Nn         nn

F1)  2/4 = 1/2 = 50% de la progenie tendrá genotipo heterocigoto, Nn

     2/4 = 1/2 = 50% de la progenie tendrá genotipo homocigota recesivo,    

     nn

     50% de la progenie será color naranja (Nn)

     50% de la progenie será color gris (nn)

               

3 0
3 years ago
What moves the plate tectonies?<br> lower mantle<br> asthenosphere<br> lithosphere<br> outer core
anygoal [31]

Answer:

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Light is an example of what in an ecosystem?
BlackZzzverrR [31]


<span>A. abiotic component</span>

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