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enot [183]
3 years ago
7

What are the four (4) requirements for natural selection to occur?

Biology
1 answer:
Tcecarenko [31]3 years ago
5 0
Natural selection isn’t actually real it’s made up by scientist it’s a trick question so no requirements
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Fill in the blanks of the following sentences. A chromosome contains one long __________ molecule. Each gene in this molecule gi
Rashid [163]

1. A chromosome contains one long DNA molecule.

DNA or deoxyribonucleic acid is a fundamental and essential macromolecule that is built from the chain of nucleotides. A nucleotide consists of one of four nitrogen-containing nucleobases (cytosine [C], guanine [G], adenine [A] or thymine [T]), a sugar called deoxyribose, and a phosphate group. DNA carries the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms. It is organized (packed) into structures-chromosomes and during cell division, these chromosomes are duplicated in the process of DNA replication. The process of replication provides each cell with its own complete set of chromosomes.

 

2. Each gene in this molecule gives the instructions for making a PROTEIN.

The genetic information in a genome is held within genes. Genes are a sequence of DNA that codes for a molecule that has a function, and usually, it is a protein. During gene expression, the DNA is first copied into RNA in a process called transcription. Then, synthesized RNA can be directly functional or be the template for a protein that performs a function. Synthesis of protein from RNA is a process called translation.

 

3. Both chromosomes in a pair of HOMOLOGOUS chromosomes have the same GENE, but the two chromosomes may have different ALLELES.

Homologous chromosomes are a set of one maternal and one paternal chromosome. Those chromosomes pair up with each other inside a cell during meiosis. Homologs have the same genes in the same loci but the alleles may be different, resulting in different phenotypes of the same genes. During the meiosis, the process of crossing over occurs when homologous chromosome pair exchange parts of DNA with one another.

 

4. Chromosomes that are not homologous have different GENE which gives the instructions for making different kinds of proteins.

Non-homologous chromosomes differently from homologous consist of alleles of different types of genes. Non-homologous chromosomes do not pair during meiosis and the shape of the chromosome, the length of the arms and the position of the centromere, is different among those chromosomes.

4 0
3 years ago
Read 2 more answers
Which of the following would likely reduce the threats posed by exotic species to native species?I. Increasing inspections of go
Tamiku [17]

Answer:

A. I only

Explanation:

Exotic animal species are really found in most countries and given that people these animals, they are very valuable. Species like lions, tigers, parrots, cheaters and even pythons are loved for exotic nature.

For this reason, they are caught, killed, shipped and sold in various countries or regions like dubia, Saudi Arabia etc. Its effects on the population of these species are disastrous.

If the inspection of goods coming into a country is intense and frequent, it will mitigate the shipping and sales of the species.

3 0
3 years ago
An organism is homozygous dominant for one trait and heterozygous for another. What is the probability of the organism producing
adell [148]

Answer:

C.1 out of 2

Explanation:

The probability of the organism producing a gamete with one dominant allele and one recessive allele for these trait is 2 out of 4 which can be further reduced to 1 out of 2.

For a cross between Homozygous and heterozygous individual we will get 2 homozygous and 2 hetrerozygous individual. The heterozygous individual has one homozygous allele and one heterozygous allele

4 0
3 years ago
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Scientists observed that the populations of top-level consumers in a particular ecosystem were rapidly decreasing. Further studi
yanalaym [24]

Answer:

The correct answer is - decreased population size at all levels.

Explanation:

A decrease in the productivity of producers of an ecosystem will lead to a decrease in all other organisms of the ecosystem including top-level consumers to the bottom-level producers due to the fact that producers provide energy and food to primary consumers.

It is because they are the only organisms that convert the sunlight to usable energy and food that transfer from one trophic level to other, so if the population of producers or their productivity will decrease then there will be decreased population size at all levels.

5 0
2 years ago
What sensory information is encoded for by hair cells in the maculae of the saccule and utricle? What is the function of the oto
Fittoniya [83]

Answer and Explanation:

The sensory information encoded for by the hair cells in the maculae of the saccule and utricule are:

  • the direction and strength of mechanical stimuli (polarity information)
  • Response to the head's rotational movement

Functions of the otoliths

The otoliths provide balance, movements and serve as directional indicators in vertebrates. They help higher vertebrates in sound detection.

Functions of the vestibular nuclei

  • Maintenance of equilibrium and posture
  • Modification of muscle tone
  • Relays information to the cerebral cortex
  • Directing the movements of the head and eye
  • Maintaining the line of vision
6 0
3 years ago
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