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den301095 [7]
4 years ago
9

Plate tectonic boundaries were first identified by ________.

Biology
1 answer:
krek1111 [17]4 years ago
3 0
Plate tectonic was 1st identified by maps
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Heterotrophs obtain chemical energy from ______________.
loris [4]

Answer:

Heterotrophs obtain chemical energy for their survival by eating plants and animals.

Explanation:

  • The chemical energy that organism need comes from food. They break this food down to obtain energy.
  • Depending on their source of nutrients , they are classified into: Autotrophs and Heterotrophs.
  • Autotrophs use sunlight and photosynthesize to produce their own food. They are often known as producers.
  • Heterotrophs are beings that can't prepare their own food and consume other organisms to obtain energy.They are also called consumers.
  • Examples include: Animals, fungi,etc.
8 0
3 years ago
which offspring could not arise from the parent cells with the chromosomes shown below? Assume crossovers can occur between chro
aev [14]
The answer is B because with 3/4 of the L trait being dominant, it’s impossible to have an offspring with the recessive trait
8 0
4 years ago
Read 2 more answers
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
The main sugar that is used as a reactant in cellular respiration is called blank
laila [671]
I think it’s glucose
4 0
3 years ago
Read 2 more answers
Rachel is in the first period of prenatal development. this scenario indicates the _____ of prenatal development.
german
Rachel is in the first stage of prenatal improvement. Even though she doesn't know it, she is in the germinal stage of prenatal development. The germinal period of development takes place in the first two weeks after the conception. The creation of the fertilized egg takes place in the germinal period of the prenatal development. 
3 0
4 years ago
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