advance directive - a written statement of a person's wishes regarding medical treatment, often including a living will, made to ensure those wishes are carried out should the person be unable to communicate them to a doctor.
The chromosomal and single-gene disorders are hereditary in nature and therefore, can be transmitted from parents to offspring.
Further Explanation:
A change or mutation in a particular gene of DNA results in a specific inheritance pattern and is called single-gene disorder. Such disorders are rare in the population and can be tracked easily within a family. The probability of its occurrence in the future generation can also be predicted. This disorder is categorized into three types: recessive, dominant, and X-linked.
When the dominant allele of a gene is affected it suppresses the expression of the other healthy allele is it recessive or dominant. It usually occurs in the heterozygous state. As a result the mutant allele gets expressed and displays the symptoms of the disease. The mutated dominant allele is passed onto every generation and therefore, the disease is expressed in everyone in the family. For example, Huntington’s disease is a disorder in the brain in which a single gene on chromosome 4 is defective.
In recessive disorders, the recessive allele is defective and the disease occurs only in the homozygous state when both the defective alleles are present. In case of heterozygous state, the healthy allele can suppress the expression of the recessive mutant allele. In order to transfer the disease to the offspring, both the parents must contain the defective allele. For example, sickle cell anemia.
The presence of defective X chromosome results in X-linked diseases. It can be either a recessive or dominant disorder. These disorders are mostly seen in males as they contain only one copy of the X- chromosome. Examples are hemophilia and Rett syndrome.
A mutation or abnormality in a person’s chromosomes results in chromosomal disorders. Down syndrome represents a chromosomal disorder in which an extra copy of chromosome 21 is usually present in an embryo. The extra copy is transmitted genetically from either parent to the offspring and causes developmental changes in the embryo as a result of which the child becomes mentally and physically abnormal.
Learn more:
1. Learn more about difference in DNA and RNA brainly.com/question/334927
2. Learn more about similarity between aerobic and anaerobic respiration brainly.com/question/1544781
3. Learn more about site of protein synthesis brainly.com/question/1420458
Answer Details:
Grade: College Biology
Subject: Genetics
Chapter: Single gene and Chromosomal disorders
Keywords:
Chromosomal disorders, single-gene disorders, mutation, chromosomes, genes, allele, Huntington’s disorder, Down syndrome, Sickle cell anemia, recessive disorders, dominant disorders, X-linked disorders.
completes the statement.
1. A substance added to food to improve its
taste, texture, or appearance is called a
.
2. The amount of a nutrient that you need
each day is its .
3. A disease caused by bacteria or
viruses in food is known as a
.
4. A condition in which the body’s immune
system reacts to substances in some
foods is a .
5. A negative reaction to food that does
not involve the immune system is a
.
food intolerance
food allergy
food additive
foodborne illness
daily value
II. Directions Write a plus (+) in the space provided if the statement is true.
If the statement is false, cross out the underlined word or phrase and write the
correct word or phrase in the space provided.
6. The ingredient that makes up the largest share of the weight of a food comes
last in the ingredients list on the food label.
7. A food labeled low fat can be eaten regularly without exceeding the daily limit
for fat.
8. A method of treating food with heat to kill or slow the growth of pathogens is cross-contamination.
9. The Dietary Guidelines outline four basic steps for keeping food safe: clean,
prepare, cook, and chill.
10. Expiration dates show the last day on which a store should sell a product.
it is A t or - if it is a - what do replace the word with
Answer:
A
Explanation:
Answer:
A
Explanation:
Breathing, and lungs. They are the most important.
Answer:
egg
Explanation: