In guinea pigs, a single gene with two alleles (B and b) determines coat color. Black (B) is dominant over white (b). A guinea pig from a true-breeding black strain is mated with a guinea pig from a true-breeding white strain. The F1 progeny are all black. Two of the F1 progeny are mated with each other. What proportion of the black F2 progeny is expected to be heterozygous?

Answers

Answer 1

Answer: Answer: Half of the black F2 progeny is expected to be heterozygous.

Explanation: I used a Punnett square to predict the next generations’ alleles.

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3. A section of DNA has been mutated.The original DNA was TAC CTC ACC GAG CGT.
The mutated DNA is TAC CTC ACT GAG CGT.
What is the impact of this particular mutation on the organism? In order to find out, you need to transcribe and translate the codons.

Answers

Answer:

The mutation that involves the change in the sequence of DNA bases is reflected both in the transcription of mRNA and in translation, giving rise to an alteration in the protein, which may not function and whose impact on the organism is a morphological or functional alteration.

Explanation:

According to this scenario, the DNA has experienced a mutation by changing the sequence by one of its bases, Cytosine by Thymine, producing in the mRNA a termination codon that interrupts the normal synthesis of the protein, preventing that protein from fulfilling its function. This particular mutation is called Nonsense mutation.

For normal DNA

DNA TAC CTC ACC GAG CGT

mRNA AUG GAG UGG CUC GCA

Protein Met - Glu - Trp - Leu - Ala

For the mutated DNA

DNA TAC CTC ACT GAG CGT

mRNA AUG GAG UGA CUC GCA

Protein Met - Glu - STOP - Leu - Ala

The change of a cytosine by Thymine in the mutated DNA produces that the third codon of the mRNA is altered, encoding a UGA termination codon, which prematurely stops the protein synthesis and originates an incomplete protein, probably not functional, whose impact in the organism is a morphological or functional alteration.

Osmosis is explained by the selective permeability of membranes combined with ______ , which is defined as the process of random movement toward a state of equilibrium

Answers

Answer: Diffusion

Explanation:

The osmosis is explained as the selective permeability of the membranes which allows the movement of the solute from higher concentration to lower concentration.

This is associated with diffusion which can be defined as the random movement of the particles in order to attain equilibrium.

The diffusion allows the movement of the particles and osmosis allows the movement of only selective materials.

2. Sperm and egg combine in ______________ to produce a zygote with the normal number of chromosomes.

Answers

I think in the Fallopian tubes

Answer:

Fertilization

Explanation:

What are transgenic organisms? Give one advantage of a transgenic crop.

Answers

Answer:

Transgenic organism:

Transgenic organism may be defined as the organisms whose genetic makeup has been modified by the molecular techniques. These transgenic organism are mainly produced in the laboratory for research work. The genes of one species can be modified or some other gene has been inserted in the organism.

Advantage of transgenic crop.

The transgenic crop has been produced by the genetic alteration of the crop. The main advantage of the transgenic crop is to develop the enhanced quality and quantity of crop. Vitamin rich golden rice has been produced by the transgenic crop.

Answer:

An organism With DNA From onather organism.

Explanation:

Please help me with this question:)

Answers

400x

Is the answer to this question.

Which of these describes inference to the best explanation? it draws a conclusion based on what would best explain one's observations it is a deductive inference form it only applies to scientific observations it generally leads us away from scientific explanations?

Answers

It draws a conclusion based on what would best explain one's observations.

Inference is the process where logical consequences evolve from premises that are assumed to be true. Knowledge backed with observations and reasoning as evidence is used to make conclusions. It is also referred to as an educated guess and is not necessarily factual.

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A pharmaceutical company wanted to test a new drug developed to lessen the effects of the common cold. To test this drug, scientists tested 50 volunteers, each of whom was suffering the effects of a cold. Twenty five of the people were given the drug, while the other 25 were given a placebo, a sugar pill. None of the participants knew who was taking which pill. All participants received a pill at 8:00 am daily for the first three days of the study. All participants lived in the same environment, with the same climate, eating the same diet, and having the same level of activity. The severity of the cold, hence the effectiveness of the pill, was determined by the number of tissues each person used within 24 hours. At the end of a seven day period, it was concluded that those with the sugar pill had their symptoms disappear as well as those who had taken the new wonder drug. The executive committee decided to produce the drug anyway thinking that the public would do anything to relieve the symptoms of a cold. Type of Variable Description Dependent Variable that the researchers actually measurers, counts or observes. It is what the researcher thinks will change in response to the experimental treatment. Independent Variable that is intentionally changed by the researcher. Standardized or Controlled These variables are held constant between each group to help prevent these factors from influencing the dependent variable. Table Source: CA Surmacz (2004) Inquiring Minds Want to know: Introducing Freshmen to Experimental Design. In Tested studies for laboratory teaching. MA O'Donnell, Ed. Vol 25 Mini Workshops. Assoc. Biology Laboratory Education pp. 316-327. 1) State the research question the study aimed to address 2) What is the hypothesis? 3) Identify the independent variable versus the dependent variable. 4) What variables were held constant in this study? 5) What was the control group? 6) What data was collected during the study? 7) What this data qualitative or quantitative? 8) What was the study's conclusion?

Oh, no... you dropped your study flashcards, and now they're out of order! Put them back into the correct order for a eukaryotic cell. a. "Combine the mRNA strand with a ribosome and a tRNA carrying a methionine." b. "Unwind the DNA molecule near the promoter." c. "Exit the nucleus to the cytoplasm." d. "Transcribe the complementary RNA strand."

Today, our current understanding of evolution is an elaboration and refinement of Darwinian evolutionary theory, taking into consideration additional evolutionary mechanisms not predicted by Darwin. This unified theory of evolution is known as :