Darwin hypothesized that there are definite steps to natural selection. Consider the model here. Use the Roman numerals (I - III) to guide you through the steps. Which is an accurate description of Darwin's hypothesized theory of natural selection? A) Sexual reproduction of bacteria cause variation. Some bacteria survive and some do not. Over time all of the bacteria should become extinct.
B) In any population, variation exists. Some bacteria are resistant to antibiotics. Most bacteria die, but the bacteria that are resistant survive and reproduce.
C) In a population of bacteria that are exposed to antibiotics, some bacteria change their genetic make-up and survive. The new genetic make-up is passed on to offspring.
D) There is a change in the environment: an antibiotic is added. Some of the bacteria are capable of changing to the new environment. They survive and reproduce, passing along their favorable traits.

Answers

Answer 1

Answer:

The most appropriate answer would be D) There is a change in the environment: an antibiotic is added. Some of the bacteria are capable of changing to the new environment. They survive and reproduce, passing along their favorable traits.

Natural selection refers to the process by which organisms who are better adapted to the change in the environment have better chances for survival and reproduction.

The steps for natural selection can be explained as:

I. Inherited variation: Within a population, organisms often exhibit variations which can be inherited such as color, size, et cetera.

II. Competition: This is the phase in which organisms struggle to survive. During this, species usually produce more offspring as compared to the carrying capacity of the environment.

In the given situation, environment change is the addition of antibiotic.

III. Selection: It is the phase of differential reproduction that is, organisms who are best adapted to the environmental change have better chances to mature to reproductive age. They reproduce and pass the beneficial traits to the offspring.

Bacteria which are better adapted to the new environment survive, reproduce, and pass their beneficial traits to the next generation.

IV. Evolution: Changes in allele frequency in a population accumulate over time and leads to the evolution.

Answer 2

Answer: The answer is B because if there is variation there would be certain bacteria with a favorable trait to survive when the antibiotic is released.

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Structures called microtubules are foundin the cytoplasm of most eukaryotic
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Which of the following elements are
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A. lead and zinc
B. nitrogen and carbon
C. sodium and chlorine
D. iodine and magnesium

Answers

The right answer for the question that is being asked and shown above is that: "C. sodium and chlorine." Structures called microtubules are foundin the cytoplasm of most eukaryotic cells. Microtubules are made up of
proteins and help shape and support the cell. Sodium and chlorine are the elements that are most abundant in microtubules.

What happen when a cell divides?

Answers

When a cell divides it makes two whole new cells this process is called mitosis.

When a cell divides into 2 then that means that you are growing and a cell breaking into two is called mitosis.

Where are your genes found? A. your alleles
B. your cytoplasm
C. your ribosomes
D. your chromosomes <-- my answer

What is the shape of DNA called?

A. nucleotide
B. double helix <-- my answer
C. chromosome
D. ribonucleic acid

What is the relationship between a chromosome and DNA?

A. Chromosomes are made of DNA.
B. DNA is made of chromosomes.
C. DNA manufactures chromosomes. <-my answer
D. Chromosomes manufacture DNA.
What do parents pass on to their offspring?

A. genes <-- my answer
B. double helix
C. nucleotides
D. ribosomes

Answers

1) D chromosomes 2) B a double helix 3)A chromosomes are made of DNA 4)A genes

What evidence suggests that vertebrates are more closely related to echinoderms than are any other invertebrate phyla? What evidence suggests that vertebrates are more closely related to echinoderms than are any other invertebrate phyla? a.Shared DNA sequences b.Shared morphology c.Shared patterns of development

Answers

Answer:

The correct answer is option a. "Shared DNA sequences".

Explanation:

The most reliable evidence that suggest that vertebrates are more closely related to echinoderms than are any other invertebrate phyla is the fact that vertebrates share DNA sequences with echinoderms. Among the different genes that have been analyzed between vertebrates and echinoderms, the genes involved in immunology and biomineralization are the ones practically identical among these two categories of species.

The cells of plants and animals are similar, except for a few different structures. Which structures are only found in plant cells?endoplasmic reticulum
ribosomes
chloroplasts
lysosomes
peroxisomes
vesicles
large central vacuole
Golgi complex
cytoskeleton
mitochondria
cell wall

Answers

Large central vacuoles, chloroplasts, and cell walls are only found in plant cells.

Large central vacuoles store nutrients and waste products, but they also maintain the plants' structures.

Cell walls also maintain structure and rigidity.

Chloroplasts are used in the process of photosynthesis, which only occurs in plants.

Answer:

large central vacuole and cell wall

Explanation:

just took the quiz!!

Why did Gregor Mendel choose to use purebred plants in his experiments?

Answers

Gregor Mendel is a Central European Monk who studied genetics through plants. He is greatly known as the founder of modern science genetics. In his various experiments, Mendel cross-pollinated pea plants because the peas have characteristics that have two forms. This means that pea plants have both male and female reproductive systems. They have the capacity to self-pollinate or cross-pollinate with other plants and as a result, Mendel discovered the nature of genetic inheritance.

At that time, Mendel debunked the famous “blending theory” commonly believed by scientists. This is a theory in biology where scientists believed that through time traits of organisms blend from generation to generation to create new organisms.

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