Duchenne's muscular dystrophy is an X-linked inherited disease that caused progressive loss of muscle cells. When the muscle cells die, it will be replaced by fat or connective tissue. Typical microscopic changes that can be found microscopically would be the decreased number of muscle cells and the increased number of fat/connective tissue
Answer:
In a diploid organism there are two copies of most genes.
The versions of the genes are called alleles.
Explanation:
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The genetic servants of a population are all variants of each of the genes present. These variables are possible thanks to the mutations that occur in the formation of the zygote (before or after fertilization).
When part of the DNA of an organism undergoes a point mutation (on one or a few nitrogenous bases) the body activates a series of responses to reverse it, however sometimes the mutation is maintained and can give rise to a change in a protein.
Sometimes and under certain circumstances (the change should not cause death or significant disadvantages in the body that is born) the mutation is maintained in the population giving rise to different alleles of the same gene.
In an organism there are two copies of each gene (genotype) but only one of them (phenotype) is expressed.
The allele of the gene that is expressed may depend on various factors but the dominant allele is usually expressed.
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Answer:
This question is incomplete
Explanation:
This question is incomplete. However, let's understand some terms
Activation energy is the minimum amount of energy required for a reaction to proceed. Under normal condition, when the activation energy is high, it takes longer for the reaction to proceed than when it is low.
The burning of marshmallow is an exothermic reaction as it involves the transfer of heat energy into the environment.
Responding to the environment is a characteristic of the life best shown by a living organism.
<h3>What is a Living organism?</h3>
This is referred to as a biological entity which is capable of transferring genetic traits to its offspring and also undergoes cell division which ensures its body parts grow. They are also involved in the search for food and other types of nutrients for their normal functioning.
Living organisms are able to perform such functions such as the following below:
- Growth
- Irritability
- Movement
- Reproduction
- Respiration
- Excretion etc.
Plants and animals possess special structures which enable them respond to different types of stimuli such as heat, cold etc. This enables the body system adjust and adapt thereby increasing the survival chances of the organism.
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