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mart [117]
3 years ago
10

The (duck-billed) platypus is: a A transitional species. b A monotreme. c A recent evolutionary deviation from the mammal class

of animals. d Not a true mammal.
Biology
1 answer:
xz_007 [3.2K]3 years ago
3 0
The answer is B ... i hope this helps
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If there are three nucleotides coding for each amino acid and there are 20 amino acids, are there just 20 specific codons? if no
Free_Kalibri [48]
15 amino acids hope this helps
7 0
4 years ago
Un jardinero cruzó dos plantas de flores rosadas, con la esperanza de obtener plantas con flores del mismo color. Su sorpresa fu
Temka [501]

Answer:

Este es un ejemplo de dominancia incompleta. Es una ocurrencia genética que ocurre cuando un gen dominante no expresa su manifestación completa en el alelo recesivo en un alelo dominante heterocigoto.

Por lo tanto, ambos rasgos se manifiestan, lo que resulta en la combinación de los dos alelos para los colores (blanco y rojo). Se dice que el alelo rojo dominante exhibe un dominio parcial sobre el alelo blanco recesivo, y esto da como resultado el alelo completamente rosado.

De acuerdo con la ley mendeliana, las dos flores rojas son heterocigóticas. Por lo tanto, las flores rojas heterocigóticas dominantes deben ser R. El alelo blanco es recesivo (rr) enmascarado por el rojo R,

Sin embargo, cuando se cruzan los dos alelos heterocigotos rojos:

Los fenotipos están en forma de

RR, (1) rojo Rr Rr (2) rosa rr (1) Blanco.

Esto ocurre porque el alelo rojo dominante no era total / completamente dominante en el alelo recesivo blanco en cada uno, lo que da como resultado un alelo rosa (el tercer fenotipo)

This is an example of incomplete dominance.It is a genetic occurrence  which occurs when a dominant gene does not express it full manifestation on the recessive allele in an heterozygote dominant allele.

Therefore,both traits are manifested which results in the blend of the two allele for colors(white and red).The dominant red allele is said to exhibit partial dominance over the recessive white allele.And this results in the entirely pink allele.

Based on Mendelian law the  two red flowers are  heterozygotes .Therefore, Red heterozygote dominant flowers should beRr.The white allele is recessive(rr) masked by the R-red,

However,when the two red heterozygote alleles are crossed:

The phenotypes are in the form of  

RR,(1) red  Rr Rr(2) pink  rr(1)White.

This occurs because, the dominant red allele was not fully/completely  dominant on the  white recessive allele in each,which results in pink allele(The third phenotype)

Explanation:

4 0
3 years ago
What are the three types of osmosis? What happens during each phase?
Vanyuwa [196]
An isotonic solution is when the solute concentration is balanced with the concentration inside the cell , the water movement still moves between the solution, but the rates are the same in both directions, the water is balanced inside and outside the cell .

A hypotonic solution is when the solute concentration is lower than the concentration inside the cell. water moves into the cell and can cause the cell to swell; cells that don’t have a cell wall, such as animal cells, could explode in this type of solution.

A hypertonic solution is when the solute concentration is higher than the concentration inside the cell. In a hypertonic solution, the water moves out of the cell and causes the cell to shrivel.
4 0
3 years ago
Read 2 more answers
What is the difference between osmosis and diffusion? A) osmosis only occurs in marine (salt water) organisms B) they are the sa
sasho [114]

Answer: The correct answer is: C The are the same except osmosis specifically and only involves water.

Explanation:

Osmosis is the process in which a solvent moves across a semipermeable membrane in order to dilute a concentrated solution and it ends up equalizing the concentration of the solution at both sides of the cell membrane.

On the other hand, diffusion occurs when particles move from an area of higher concentration to an area of lower concentration and it ends up equalizing the concentration.

So the main difference is the presence/ Lack of water in the processes.

In conclusion the correct answer is : C.

7 0
3 years ago
What is a scientific investigation made under controlled conditions to test the validity of a hypothesis
castortr0y [4]

An experiment is a procedure that tests a hypothesis by the process of collecting information under controlled conditions.

<h3>What is a controlled scientific test of hypothesis ?</h3>

A controlled experiment is a scientific test done under controlled conditions, meaning that just one (or a few) factors are changed at a time, while all others are kept constant.

  • Controlled experiment. an experiment that compares the effect of one manipulated variable to a group that receives no treatment. controlled variables. factors that should be kept the same in both the treatment group and the non-treated group.

Learn more about Control experiment here:

brainly.com/question/24708013

#SPJ4

4 0
2 years ago
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