Why might some people find it difficult to follow the MyPlate recommendations?

Answers

Answer 1

Answer: Some people might find it difficult because getting out of bad eating habits could be really hard. Myplate Recommendations also has a variety of fruits and vegetables that maybe some people may not be able to afford.

Answer 2

Answer:

Answer:

C. It is difficult to eat across all food groups

Explanation:

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A walking stick, a type of insect that is a primary consumer, is an example of an organism using(A) aggressive mimicry. (B) Batesian mimicry. (C) camouflage. (D) Mullerian mimicry. (E) none of the above.
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Which of these have prokaryotic cells?a.

snails

c.

bacteria

b.

frogs

d.

food

Answers

Prokaryotes lack a distinct cell nucleus and their DNA is not organized into chromosomes. They also lack the internal structures bound by membranes called organelles, such as mitochondria. Bacteria have prokaryotic cells. Snails, frogs and food, do not.

it a bacteria because snails and frogs are made up of eukaryotic cells

What is one advantage of having many small cells instead of one large cell?

Answers

With smaller cells, there is a greater surface area.

What steps are considered when constructing a recombination map using a three-point test cross?

Answers

Constructing a recombination map using a three-point test cross is a fundamental process in genetic mapping to determine the order and relative distances between three linked genes. Here are the general steps involved in this process:

1. **Select Appropriate Organism**: Begin by selecting an organism with traits controlled by three genes that you want to map. Ensure that these genes are located on the same chromosome.

2. **Create a Heterozygous Individual**: Start with an individual that is heterozygous for all three genes of interest (AaBbCc, for example). One chromosome should carry the dominant allele, and the other should carry the recessive allele.

3. **Perform Test Cross**: Cross this heterozygous individual with a homozygous recessive individual (aabbcc). This will produce progeny with a variety of allele combinations.

4. **Observe Progeny Phenotypes**: Examine the phenotypes of the progeny resulting from the test cross. Record the number of individuals with each phenotype. These phenotypes are crucial for calculating recombination frequencies.

5. **Calculate Recombination Frequencies**: Use the phenotypic data to calculate recombination frequencies between the three genes. Recombination frequency is the proportion of offspring that show a recombination of alleles (different from the parental combination).

6. **Determine Gene Order**: Analyze the recombination frequencies to determine the order of the three genes on the chromosome. The gene with the highest recombination frequency with the others is likely to be in the middle, while those with lower recombination frequencies are on the ends.

7. **Calculate Map Distances**: Calculate map distances between the genes based on the recombination frequencies. One map unit (centimorgan) corresponds to a 1% recombination frequency.

8. **Interpolate Cross-Over Frequencies**: If the recombination frequencies are not whole numbers, interpolate to estimate the exact cross-over frequencies between genes.

9. **Create a Recombination Map**: Construct a genetic map that shows the order and relative distances between the three genes. Include map distances in centimorgans.

10. **Validate the Map**: Perform statistical tests or additional crosses to validate the accuracy of the map.

These steps help geneticists create a recombination map, which provides valuable information about the genetic linkage and the physical arrangement of genes on a chromosome.

Scientific investigations often lead to the formulation of new scientific questions. The observations Charles Darwin made during his time aboard the H.M.S. Beagle prompted him to ask which question?

Answers

Answer:

Darwin's observations led him to wonder: How do species originate?

Explanation:

Darwin observed morphological traits and geographic distribution of many species as well as many fossils. From these observations the question: How do species originate?, arose. Darwin concludes that similar species must originate from a recent common ancestor with similar traits to all their descendants. This is the basis of the theory of evolution.

Whether the similarities that he was seeing bewteen extinct fossils and living animals, as well as the small differences in structure and behaviour seen in finches and tortoises on the Galapagos islands, was due to the process of natural selection. This is where a genetic variation/mutation in an animal proves beneficial to the species in their environment, while the other members of the same species with the mutation die out, as they do not have the same abilities as the mutated individuals.

State 2 differences between sexual reproduction and asexual reproduction

Answers

sexual reproduction- the process in which two sex cells join together to form a new organism.
asexual reproduction- the process in which a single organism produces a new,identical organism.

Sexual reproduction consists of the fusion of the male and the female gametes to produce an offspring.

Asexual reproduction is by budding off from the parent plant to produce offspring.

sexual reproduction: the offspring is not identical to parent.

asexual reproduction: the offspring is identical to parent.

One concern that arises from building a dam is that fish are not able to migrate. One way that fish can gain passage to their destinations is by: Select one: a. fish ladders b. fish trucks c. fish boxes d. fish escalators

Answers

A: Fish Ladder's 100%

Answer:

A) Fish Ladders

Explanation:

One concern that arises from building a dam is that fish are not able to migrate. One way that fish can gain passage to their destinations is by fish ladders. Fish ladders are structures that are built into the dam and allow fish to swim up and over the dam, so that they can continue their migration. Fish ladders typically consist of a series of pools or steps that the fish can swim up, similar to a staircase. This allows the fish to bypass the dam and continue their journey.

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