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Which of the following statements about genetic diseases are TRUE?

1) They are always manifested at birth.
2) They are always due to abnormalities in a single gene.
3) Females never demonstrate X-linked disorders such as hemophilia.
4) They are always caused by altered nucleic acid sequences, such as AATTCCGG.

1 Answer

3 votes

Final answer:

Not all genetic diseases are evident at birth, nor are they always due to single gene abnormalities. X-linked disorders like hemophilia can affect females, and genetic disorders result from changes in nucleic acid sequences, which may include complex alterations.

Step-by-step explanation:

Understanding Genetic Disease Truths

It's important to examine the statements about genetic diseases to distinguish fact from misconception. Here is the truth about each assertion:

  • Genetic disorders are not always manifested at birth. Some may only become apparent later in life, such as Huntington's disease.
  • Genetic disorders are not always due to abnormalities in a single gene. Some are caused by chromosomal mutations or by a combination of multiple gene mutations.
  • Females can indeed demonstrate X-linked disorders such as hemophilia, though they are less likely than males to be affected due to the presence of two X chromosomes, one of which may carry a normal copy of the gene.
  • Genetic disorders are caused by alterations in nucleic acid sequences; however, these alterations can have a variety of manifestations and are not simply represented by a string like AATTCCGG.

In summary, not all genetic diseases are caused by a single gene mutation, not all are evident at birth, and X-linked disorders can affect both males and females, though with different probabilities based on their genetic makeup.

User Parthiban Soundram
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