Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents?

Answers

Answer 1
Answer:

The genotype of the mother is XX while the genotype of the father is XY.

A genotype simply means the collection of genes in an individual. It is also referred to as the alleles that are inherited in a particular gene.

In this case, since red-green color blindness is a recessive trait, this implies that it will not be visible in a heterozygous female. Hence, the dominant allele will therefore mask the recessive allele.

Since the father has only one X chromosome, then if the trait was present in that X chromosome, he must have shown the trait because all the alleles in Y chromosome are recessive. In this case, the son has inherited the trait from the mother.

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Answer 2
Answer:

Genotype of Mother: XX°

Genotype of Father: XY

Explanation:

  • Since the Red-green colour blindness is a recessive trait , it will not be visible in a heterozygous female because dominant allele will mask the recessive allele.
  • Father has only one X chromosome, thus if the trait was present in  that X chromosome he must have shown the trait because all the alleles in Y chromosome are recessive.
  • Since the son has inherited the trait it is obvious that he had recieved the trait from his mother who must have been the carrier.

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In a typical food chain, about what percentage of energy is passed on to the next trophic level? A) 1% B) 10% C) 20% D) 40%

Answers

b. 10% is passed on and 90% is used

A depression in the ground due to a cave collapse or acidic water dissolution of limestone is called a A. cave. B. stalactite. C. sinkhole. D. stalagmite.

Answers

A cave is a cave...you know, something generally in the rock, something that bears sleep in. It isn't really a depression in the ground. A stalactite is a build up of sediments from the ceiling that drip down to form a icicle shaped rock hanging from the ceiling, and a stalagmite is the same thing, but on the ground. So out of all those choices, I would choose answer D, a sinkhole.

Which of the following statements is true about photosynthesis and cellular respiration?a. both processes use oxygen as a reactant.
b. Plants perform photosynthesis
c. Plants perform cellular respiration
d. Plants perform both of photosynthesis and cellular respiration

Answers

Plants perform both photosynthesis and cellular respiration.

During photosynthesis, the plant converts solar energy into chemical form. Plant captures light that comes directly from the sun and through different ranges of reaction, using its energy to build sugar molecules known as glucose.

Further Explanation

Glucose consists of six oxygen atoms, six carbon atoms and twelve hydrogen atoms. When plant produces glucose molecules, it gets the carbon and oxygen it required to make the glucose molecules from carbon dioxide taken from the air.  

Although there is no presence of hydrogen in carbon dioxide, therefore the plant uses water to replace hydrogen. The world is surrounded with large volume of water and every water molecules is made of two hydrogen and one oxygen atom.

For the plant to take the hydrogen needed to build molecules, it use the energy obtain from the sun to split the water molecule apart. During photosynthesis, plant consumes carbon dioxide water, and produces oxygen and glucose.  

The glucose produced by the plant is important for cellular respiration. During cellular respiration, the presence of chemical energy in the glucose molecules is converted into a form that plant can utilize for reproduction and growth.

The first step of respiration is known as glycolysis, at this step the glucose molecule is broken down into molecules that are smaller also known as pyruvate and a little energy is also released in the form of ATP. The result of cellular respiration in plant is that it consumes oxygen and glucose and produces water, carbon dioxide and ATP energy molecules

LEARN MORE:

KEYWORDS:

  • plants
  • photosynthesis
  • cellular respiration
  • oxygen
  • carbon dioxide

Final answer:

The statement that plants perform both photosynthesis and cellular respiration is correct. Photosynthesis is a process used to synthesize food with sunlight and cellular respiration coverts the produced sugar into usable energy.

Explanation:

The correct answer to the question is d. Plants perform both photosynthesis and cellular respiration.Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll pigments. Oxygen is a product in this process, not a reactant.Cellular respiration is the process by which cells in plants, animals and other organisms break down sugar and turn it into energy, which is then used to perform work at the cellular level. This process does use oxygen as a reactant to convert the stored sugar into usable energy.

Therefore, plants do both photosynthesis (to make sugar and produce oxygen) and cellular respiration (to break down the sugar into usable energy).

Learn more about Photosynthesis and Cellular Respiration here:

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20 different ___ ___ link together to form chains. A protein is composed of one or more of these ___ chains which are twisted and folded into a particular shape.

Answers

Answer: Amino acids; peptide

Explanation:

20 different AMINO ACIDS link together to form chains. A protein is composed of one or more of these PEPTIDE chains which are twisted and folded into a particular shape.

There exists 20 amino acids capable of forming protein in the Human body. At least two amino acids are joined together by a peptide bond to form polypeptide chains that are then held together by hydrogen bonds in twisted alpha helical structures to form proteins.

Answer:Amino acid, polypeptide/polynucleotide chains

Explanation: Amino acids are usually the building blocks of protein hence,every protein is made up of one or more amino acids.

A protein consist of one or more polypeptide chain that is folded into a helix shape. This shape is to prevent the easy degradation of the components that makes up the polypeptide because it is water loving and can easy degrade.

If I exposed a eukaryotic cell to a drug that inactivated the ribosomes, the synthesis of which of molecules would be affected first (and probably the most)? In fact some antibiotics kill bacteriabecause they inactive this part of the cell.
O proteins
O amino acids
O lipids
O steroid hormones

Answers

Either A or D that’s my best guess

Which description best explains Watson and Crick's DNA model? DNA is a single–stranded molecule that has nitrogenous bases toward its exterior. DNA is a double helix made of two strands linked together with hydrogen bonds. DNA is a double helix that contains nitrogenous bases toward its exterior.

Answers

The discoverers of DNA were not JamesD Watson and Francis Crick. They are the first scientist to formulate anaccurate description of the DNA’s (deoxyribonucleic acid) complex ,double-helical structure. They discovered that base pairing nucleotides mustbe; adenine and thymine; and cytosine and guanine. These base pairs are heldtogether by a hydrogen bond, atype of chemical reaction that s easy to breakand easy to reform. The statement is “DNAis a double helix made of two strands linked together with hydrogenbonds.”