Question

1. a mutation is a permanent change in the sequence of dna.
2. most mutations occur ____
3. in a ____ mutation, one nitrogen base is replaced by a different nitrogen base.
4. in an ____ mutation, one or more nitrogen bases are added to the dna.
5. in a ____ mutation, one or more nitrogen bases are left out of the dna sequence.

what happens when a mutation occurs?

1. because mutations can change ____ they can cause traits to change.

Explanation:

Answer:

1. (blank for definition, but if filling type: "gene" (since mutation is permanent change in DNA sequence, often gene - related, but the first blank is for the term's definition part, maybe "gene" or "DNA" but the first sentence is "A mutation is a permanent change in the sequence of DNA." So no fill - in needed here as it's a statement. Wait, maybe the blanks are for types of mutations? Let's re - examine:

1. Most mutations occur spontaneously (common answer, but if following mutation types: maybe "randomly" but standard is "spontaneously" or "naturally" but maybe the blank is for "randomly" or "during DNA replication" but the question's blanks:

1. In a substitution mutation, one nitrogen base is replaced by a different nitrogen base.

1. In an insertion mutation, one or more nitrogen bases are added to the DNA.

1. In a deletion mutation, one or more nitrogen bases are left out of the DNA sequence.

1. (the last part: "Because mutations can change genes (or "DNA sequences") they can cause traits to change."

But since the problem is about mutations (Biology subfield of Natural Science), the answers for the blanks (assuming they are types of mutations and related concepts):

1. (blank) spontaneously (or "randomly", but common answer for "most mutations occur" is "spontaneously" or "during DNA replication", but likely "spontaneously")

1. substitution

1. insertion

1. deletion

1. (the last blank) genes (or "DNA sequences")

But to match the subfield: Natural Science - Biology.

The answers for the blanks (assuming the numbered blanks 2 - 5 and the last blank):

1. spontaneously (or "randomly", but standard in biology: most mutations occur spontaneously)

1. substitution

1. insertion

1. deletion

1. (the last blank) genes (or "the DNA sequence")

But if we need to fill the blanks with mutation types and related:

1. (blank) spontaneously (or "naturally")

1. substitution

1. insertion

1. deletion

1. (the last blank) genes (since mutations in genes can change traits)

So the answers for the blanks (in order of the numbered questions with blanks):

1. spontaneously (or "randomly" - but "spontaneously" is more accurate)

1. substitution

1. insertion

1. deletion

1. (the last blank) genes

But since the problem is about Biology (Natural Science), the subfield is Biology (Natural Science). The answers to fill the blanks (assuming the blanks are for:

1. Most mutations occur [spontaneously]

1. In a [substitution] mutation...

1. In an [insertion] mutation...

1. In a [deletion] mutation...

1. Because mutations can change [genes]...

So the filled blanks (answers):

1. spontaneously

1. substitution

1. insertion

1. deletion

1. genes

(Note: The first question "A mutation is a permanent change in the sequence of DNA." has no blank to fill as it's a statement, so the blanks start from question 2 onwards.)