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3 years ago

What is responsible for telling cells how to behave

2 answers:

tatiyna3 years ago

6 0

Scientists found that the cytoplasm of cells undergoing mitosis, if injected into cells at other stages of the cell cycle, could induce the non-dividing cells to start mitosis. This suggested that a chemical signal was present in the cytoplasm of dividing cells that was responsible for "telling" the cells that they should proceed into mitosis. By fractionating the cytoplasm into its components, scientists were able to isolate the signal that triggers mitosis.

dimulka [17.4K]3 years ago

3 0

Answer:

Cellular differentiation and signaling

Explanation:

Cells specialize in their functions due to the process of differentiation, transforming embryonic cells into new cells with specific morphology and physiology.

The behavior of cells for different functions is due to gene expressions and also thanks to receptors on the surface and inside the cell.

These receptors bind to signaling molecules, establishing communication between the nervous system and the others, ensuring the specificity of cells.

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Laws can help protect endangered species by prohibiting a. captive breeding. b. habitat preservation. c. diversity of genes. d.

Svetradugi [14.3K]

Hello there,

Laws can help protect endangered species by prohibiting products made from the species.

I hope this helps! m:(

~HotTwizzlers

5 0

3 years ago

What type of variation is nessary for natural selection to occur

grandymaker [24]

Answer:

Genetic variation

Explanation:

Genetic variability (diversity) stems from two basic processes: mutation and recombination.

If there were no mutations, all genes would exist in only one form, they would not have alternative forms.

Since phenotypic variability also depends on genetic variability, it is clear that the processes of mutation and recombination contribute to the creation of a large number of different phenotypes.

3 0

3 years ago

Five carbon sugar found in DNA nucleotides, differs in ribose lacks a hydroxyl. (Group at the 2' carbon)

ozzi

It’s the bottom right of the ribose

7 0

3 years ago

If a heterozygous parent (AB/ab) is testcrossed to a homozygous recessive (ab/ab), what will the progeny phenotypic ratio be if

ra1l [238]

Answer:

Phenotypic ratio 1:1:1:1

Explanation:

A test cross is a cross between an individual with heterozygous genotype and a homozygous recessive individual, in order to ascertain the actual genotype of the dominant parent i.e whether homozygous or heterozygous.

In this case, which is a dihybrid cross involving two genes A and B. The allele A is dominant over allele a, since it masks the expression in a heterozygous state. The same applies for allele B and b.

Therefore, allele A and B are dominant alleles while allele a and b are recessive alleles.

In a cross between an heterozygous parent (AaBb) and a homozygous recessive (aabb), each individual will undergo meiosis and produce gametes. According to Mendel's law of independent assortment, the alleles of each individual get sorted into gametes independent of one another.

The four possible gametes produced by each parent are:

AaBb: AB, Ab, aB, ab

aabb: ab, ab, ab, ab

Thus, using a punnet square (see attached image), the possible 16 progenies will possess four different genotypes: AaBb (4), Aabb (4), aaBb(4), aabb(4)

Considering the four distinct genotypes, the phenotypes will also differ. Hence, the phenotypic ratio: 4:4:4:4 ~ 1:1:1:1

3 0

3 years ago

Which of these is a the most likely descendent of an organism that had large canine teeth for biting, powerful muscles for runni

Anna35 [415]

Answer:

might be a house cat because they have sharp teeth

5 0

3 years ago

Read 2 more answers