Looking at the present, the evolutionary relationships between extant species can be seen in the presence of body parts sharing a common basic design. These structures are descended from a common ancestor. Sometimes, structures which no longer serve their original function are found in modern species. What is this structure?

Q: For a particular locus the frequencies for three alls are 48% 30% and 22% respectively this means th...

A: Minor allele frequency (MAF) is the frequency at which the second most common allele occurs in a giv...

Q: Explain how prokaryotic cells reproduce.

A: Prokaryotic cells have genetic material but no nucleus; instead, their genetic material is stored in...

Q: There was a large proliferation of fossils showing increase in diversity of life.What period is this

A: Geological time scale is the calendar for events in Earth's history. It is divided into eras, period...

Q: 2. For each DNA sample, draw a linear stretch of DNA about 15 nucleotides long, with a nucleotide co...

A:

Q: What general measure/s can you recommend in order to prevent the majority of the parasitic and funga...

A: a) Providing water sources free of pathogens.  b) Protection from the transfer of pathogens.  c) Dis...

Q: How do protozoa digest?

A: Protozoa digest their food through intracellular digestion, which means that organic material is abs...

Q: Does an mRNA molecule codify only or type of protein?

A: Eukaryotic cells have monocistronic mRNA, indicating that each mRNA codifies only one polypeptide ch...

Q: Which of the following are related to the health policy trilemma? (Please choose all that may apply)...

A: Health policy trilemma. 

Q: gy to explain vour am

A: In the case of the celery in salt water, water would leave the cells and the stalk will become wilte...

Q: List the step common to all viral replication pathways.

A: ANSWER:   Viruses are obligate intracellular pathogens therefore Virus particles need the machinery ...

Q: Complete dominance at both gene pairs but the first gene when recessive is epistatic to the second g...

A: Epistasis is an interaction that occurs at a phenotypic level and is governed by genotypic interacti...

Q: Ouestion 3 Researchers have found that children who engage in more private speech as they solve prob...

A: Private speech is produced aloud by young children which seems to be addressed either to the self or...

Q: An ebony strain of flies was discovered to be sensitive to carbon dioxide. Crossing a female sensiti...

A: Abstract Mutations that influence the sensitivity of an organism to a volatile general anesthetic c...

Q: A. Examine the crosses above and deduce the origin of G. hirsutum. Diagram your cross and give level...

A: Examine the crosses above and deduce the origin of G. hirsutum. Diagram your cross and give level of...

Q: Criteria for Facilitated Diffusion Comparison Pinocytosis (Difference) (Similarity) (Choice)

A:

Q: If the stain is too red to the naked eye, what can be done to correct this? O that is normal O check...

A: Staining is a microscopy auxiliary method used to improve contrast in the microscopic image. Stains ...

Q: Characterize environmental, infectious, and nutritional disease agents in aquaculture based on their...

A: Aquaculture is the human cultivation of various marine organisms for commercial and also for researc...

Q: For mumbers 34-50. Given the following pedigree, answer the following questions. Ist generation woul...

A: The pedigree analysis helps us identifying the mode of inheritance of a particular disease by observ...

Q: An 18 year old female was rushed to the hospital because she was found unconscious in her room. The ...

A: It can be stressful whenever kids are in the hospital — and even more so when they're in the pediatr...

Q: How Plasmids are introduced into bacteria ?

A: Bacteria are the prokaryotes that have their DNA present in the cytoplasm.  

Q: Because introns are present in all eukaryotes and a few prokaryotes, biologists hypothesize that int...

A: Noncoding regions of an RNA transcript or the DNA encoding it that are spliced off before the RNA mo...

Q: As people get older, plaque can build up in the main arteries in the area of accumulation. How does ...

A: Change in rate of blood flow and blood pressure due to formation of plaque in arteries in older age....

Q: How many electrons have to move through the light dependent reactions to make molecules of glucose? ...

A: In order to understand what photosynthesis is, we must first understand what plants need in order to...

Q: Draw a diagram of what occurs in PCR during the annealing step of the FIRST cycle. b. Draw a diagram...

A: The PCR or polymerase chain reaction is a routinely used technique in molecular biology. It is used ...

Q: You are given a plant that you have never seen before (see figure). Is it a gymnosperm or angiosperm...

A: Plants can be divided into several categories on the basis of presence of vascular bundles or flower...

Q: a) Replicate this sense strand to create a double-stranded DNA helix  TGAGGATGAAACTCACACCGGGGCGCAGT...

A:    

Q: . An ebony strain of flies was discovered to be sensitive to carbon dioxide. Crossing a female sensi...

A: Introduction A reciprocal cross is a breeding experiment used in genetics to determine the impact of...

Q: Using the skills you learnt in the DNA Analysis tutorial, correctly identify the gene and the specie...

A: The method of identifying the nucleotide code - the sequence of base sequence – is known as DNA sequ...

Q: you performed a sanger sequencing on a particular segment of DNA. Explain at the molecular level wha...

A: Effect on gel profile when we either forgot to add ddNTPs Or add more ddNTPs in test tubes during sa...

Q: When Mendel examined the inheritance of pod colour, he crossed true-breeding green and true-breeding...

A: *mendel crossed true breeding yellow and true breeding green for pod colour contrasting character. *...

Q: In any human body cell, all chromosomes have the same shape and length.

A:

Q: Considering the Fluid-Mosaic Model of cellular membranes, supply the biomolecules primarily responsi...

A: The cell membrane forms a protective layer between a cell and its surroundings, controlling the flow...

Q: How is filament polarity detectable?

A: Microfilaments in the cell form structures associated with the plasma membrane.

Q: Do algae reproduce sexually or asexually?

A: Algae are eukaryotic and photosynthetic organisms and range from unicellular forms like Chlorella to...

Q: Alternatively, selection may be performed during mating, where mating is done after a selection proc...

A: This paragraph is talking about biological selection which is the kind of natural selection and his ...

Q: Identify the term that best matches the definition or description given. a trait found on the X or Y...

A: A trait found on the X or Y chromosome        =    sex-linked trait  Genes that are on the same chro...

Q: The average pressure in the artery: located in the head is O Below average pressure in an artery in ...

A: *mean arterial pressure is the average arterial pressure of one cardiac cycle that includes systole ...

Q: Complete the table to determine the amounts of other nucleotides found in each DNA sample.

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Q: What are the differences of the common 4 layers of the: 1) esophagus? 2) stomach? 3) small intestine...

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Q: Different between alternative complement pathway and Lectin pathway.

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Q: Why is energy surplus required for lean muscle mass gain and why is it a major challenge for most at...

A: Our body requires a significant amount of energy for performing it's normal daily activities. These ...

Q: Quasi-experiments

A: A quasi-experiment is an empirical interventional study used to estimate the causal impact of an int...

Q: A. Examine the crosses above and deduce the origin of G. hirsutum. Diagram your cross and give level...

A: Introduction: Bivalent is the term given to the association of the homologous chromosome as pairs th...

Q: You are required to completed an in-depth study of a common disease bacterial spot affiliated with t...

A: Bacterial brown spot disease  Bacterial brown spot is a disease of dry beans caused by bacterium Pse...

Q: what signals are the microbes using to effect normal signaling during development?

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Q: Explain the several key properties of DNA vectors ?

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Q: Question 26 refers to QTL on the cricket autosomes. Forthe sex chromosomes, females crickets are XX ...

A: The female is XX and is the homogametic sex of species such as crickets, grasshoppers, and certain o...

Q: What are the benefits of tryptophan?

A: Introduction Tryptophan:- Tryptophan is an α-amino acid that is used in the biosynthesis of proteins...

Q: Discuss DNA replication of prokaryotes and please mention all of the enzymes and components listed b...

A: DNA Replication mechanism  The process of replication in living cells requires a set of enzymes. The...

Q: Ellie was testing her and her parents blood types. She found that her blood type was type O. Her mot...

A: The ABO  and Rh blood grouping and typing tests mainly involves the principle of agglutination react...

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.