DNA (Deoxyribonucleic Acid): The molecule that contains the genetic instructions for the development, functioning, growth, and reproduction of all living organisms. It is composed of two strands forming a double helix (source content).
Chromosomes: Structures made of condensed DNA that carry genetic information. They are visible during cell division and contain genes (source content).
Genes: Units located on chromosomes that carry the instructions for specific traits. They determine characteristics such as eye color or blood type (source content).
Chromosome Number: The total number of chromosomes in a cell, which varies by species. For example, humans have 23 pairs (46 chromosomes), while dogs have 39 pairs (78 chromosomes) (source content).
Each cell contains DNA that is condensed into chromosomes, which organize genetic information efficiently (source content).
Chromosomes carry genes that determine traits such as sex (XX for female, XY for male), species identity, and certain diseases (e.g., trisomy 21 involves an extra chromosome 21) (source content).
1. What is a chromosome?
2. What is the primary structural component of DNA that carries genetic instructions?
3. What is the composition of human sex chromosomes in females?
DNA — structure?
Double helix of nucleotides.
DNA — structure?
Double helix of two strands.
Chromosomes — function?
Carry genetic information in condensed form.
Chromosomes — function?
Carry and organize genetic information.
Sex chromosomes — role?
Determine biological sex (XX or XY).
Gene variants — influence?
Cause trait differences like hair color.
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