Question

1. earlobes can be __________ or ________________
2. a ______ is a piece of the _______ molecule
3. the four chemicals of dna are

a.
b.
c.
d.

Explanation:

Question 24:

Earlobe types are a classic example of a Mendelian trait in genetics (a subfield of Biology). Earlobes can be either attached or free (unattached). This is a common genetic characteristic used to illustrate dominant and recessive traits, where free earlobes are typically dominant and attached earlobes are recessive.

Question 25:

In the context of genetics and molecular biology, a "gene" is a segment (piece) of the "DNA" (deoxyribonucleic acid) molecule. Genes are the basic units of heredity and contain the instructions for building and maintaining an organism. DNA is the molecule that carries genetic information in most living organisms.

Question 26:

DNA (deoxyribonucleic acid) is composed of four nucleotide bases (chemicals) which are:

• Adenine (A): One of the purine bases.
• Thymine (T): One of the pyrimidine bases, which pairs with Adenine in DNA.
• Cytosine (C): Another pyrimidine base.
• Guanine (G): Another purine base, which pairs with Cytosine in DNA.

These four bases form the rungs of the DNA double helix structure and are the basis for the genetic code through their specific pairing and sequence.

Answer:

24.

Blank 1: attached
Blank 2: free (unattached)

25.

Blank 1: gene
Blank 2: DNA

26.

a. Adenine (A)
b. Thymine (T)
c. Cytosine (C)
d. Guanine (G)