Educational worksheet explaining chromosomes, genes, and DNA structure.
Diagram showing chromosomes, genes, and DNA with corresponding definitions and illustrations.
PNG
1200×1698
356.8 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #799044
⭐
Show Answer Key & Explanations
Step-by-step solution for: Activity no. 4.1 Chromosomes, Genes and DNA - NAME: DULAY, NASHER ...
▼
Show Answer Key & Explanations
Step-by-step solution for: Activity no. 4.1 Chromosomes, Genes and DNA - NAME: DULAY, NASHER ...
The image you've uploaded is a completed worksheet titled "Activity no. 4.1 CHROMOSOMES, GENES and DNA" for a biology class. The task requires students to fill in the blanks using provided keywords related to genetics. Below is a detailed explanation of the completed answers and how they fit into the context of chromosomes, genes, and DNA.
---
This activity teaches the relationship between chromosomes, genes, and DNA, which are fundamental components of heredity and genetics.
Let’s go through each section and explain why the answers are correct.
---
#### 1. Chromosomes
> "Chromosomes are found inside the NUCLEUS of a cell. There are 23 pairs of chromosomes in every human body cell. One of each pair of chromosomes comes from each PARENT. Chromosomes are made up of long lengths of DNA."
- NUCLEUS: This is the control center of the cell where chromosomes are located.
- 23 pairs: Humans have 46 chromosomes total (23 from mother, 23 from father), forming 23 homologous pairs.
- PARENT: Each parent contributes one chromosome from each pair during reproduction.
- DNA: Chromosomes are composed of DNA tightly coiled around proteins.
✔ Correct!
---
#### 2. Genes
> "A gene is a short section of a CHROMOSOME. Each gene CODES for a different CHARACTERISTIC. Genes work in PAIRS. There are different versions of each gene, one is often DOMINANT over the others."
- CHROMOSOME: Genes are segments of DNA located on chromosomes.
- CODES: Genes contain instructions (code) for making proteins that determine traits.
- CHARACTERISTIC: Examples include eye color, blood type, or height.
- PAIRS: Since we inherit one chromosome from each parent, we have two copies of each gene (one from mom, one from dad).
- DOMINANT: In Mendelian genetics, a dominant allele masks the effect of a recessive one.
✔ Correct!
---
#### 3. DNA
> "DNA is short for DEOXYRIBONUCLEIC ACID. It is a long chain MOLECULE that is made up of a combination of 4 DNA bases. DNA has a special structure called a DOUBLE HELIX."
- DEOXYRIBONUCLEIC ACID: The full name of DNA.
- MOLECULE: DNA is a large biological molecule.
- 4 DNA bases: Adenine (A), Thymine (T), Cytosine (C), Guanine (G). These pair up (A-T, C-G) to form the rungs of the ladder.
- DOUBLE HELIX: The iconic twisted-ladder shape discovered by Watson and Crick.
✔ Correct!
---
From the list:
```
4 DNA pairs double nucleus characteristic chromosome
23 codes helix molecule parent dominant deoxyribonucleic acid
```
All keywords were used appropriately:
- 4 → number of nitrogenous bases
- 23 → number of chromosome pairs
- DNA → used twice (as a word and as an abbreviation)
- pairs → for genes and chromosomes
- double → part of "double helix"
- nucleus → location of chromosomes
- characteristic → what genes code for
- chromosome → where genes are located
- codes → function of genes
- helix → part of "double helix"
- molecule → DNA is a molecule
- parent → source of chromosomes
- dominant → trait expression
- deoxyribonucleic acid → full name of DNA
✔ All keywords were used correctly and logically placed.
---
| Concept | Key Terms Used | Explanation |
|--------|----------------|-----------|
| Chromosomes | Nucleus, 23, Parent, DNA | Found in nucleus; humans have 23 pairs; one from each parent; made of DNA |
| Genes | Chromosome, Codes, Characteristic, Pairs, Dominant | Segments of DNA; code for traits; come in pairs; one may be dominant |
| DNA | Deoxyribonucleic acid, Molecule, 4, Double helix | Full name: deoxyribonucleic acid; a long molecule with 4 bases; shaped like a double helix |
---
The student Dulay, Nasher R. has correctly completed the worksheet using accurate scientific terminology. The answers reflect a solid understanding of:
- The structure of DNA (double helix, four bases),
- The organization of genes on chromosomes,
- The inheritance pattern (from parents, pairs, dominance).
This shows a strong grasp of basic genetics concepts.
✔ Well done! The worksheet is fully and accurately completed.
---
🔬 Overview of the Concepts
This activity teaches the relationship between chromosomes, genes, and DNA, which are fundamental components of heredity and genetics.
Let’s go through each section and explain why the answers are correct.
---
✔ Section A: Complete the Sentences
#### 1. Chromosomes
> "Chromosomes are found inside the NUCLEUS of a cell. There are 23 pairs of chromosomes in every human body cell. One of each pair of chromosomes comes from each PARENT. Chromosomes are made up of long lengths of DNA."
- NUCLEUS: This is the control center of the cell where chromosomes are located.
- 23 pairs: Humans have 46 chromosomes total (23 from mother, 23 from father), forming 23 homologous pairs.
- PARENT: Each parent contributes one chromosome from each pair during reproduction.
- DNA: Chromosomes are composed of DNA tightly coiled around proteins.
✔ Correct!
---
#### 2. Genes
> "A gene is a short section of a CHROMOSOME. Each gene CODES for a different CHARACTERISTIC. Genes work in PAIRS. There are different versions of each gene, one is often DOMINANT over the others."
- CHROMOSOME: Genes are segments of DNA located on chromosomes.
- CODES: Genes contain instructions (code) for making proteins that determine traits.
- CHARACTERISTIC: Examples include eye color, blood type, or height.
- PAIRS: Since we inherit one chromosome from each parent, we have two copies of each gene (one from mom, one from dad).
- DOMINANT: In Mendelian genetics, a dominant allele masks the effect of a recessive one.
✔ Correct!
---
#### 3. DNA
> "DNA is short for DEOXYRIBONUCLEIC ACID. It is a long chain MOLECULE that is made up of a combination of 4 DNA bases. DNA has a special structure called a DOUBLE HELIX."
- DEOXYRIBONUCLEIC ACID: The full name of DNA.
- MOLECULE: DNA is a large biological molecule.
- 4 DNA bases: Adenine (A), Thymine (T), Cytosine (C), Guanine (G). These pair up (A-T, C-G) to form the rungs of the ladder.
- DOUBLE HELIX: The iconic twisted-ladder shape discovered by Watson and Crick.
✔ Correct!
---
🧩 Keywords Used
From the list:
```
4 DNA pairs double nucleus characteristic chromosome
23 codes helix molecule parent dominant deoxyribonucleic acid
```
All keywords were used appropriately:
- 4 → number of nitrogenous bases
- 23 → number of chromosome pairs
- DNA → used twice (as a word and as an abbreviation)
- pairs → for genes and chromosomes
- double → part of "double helix"
- nucleus → location of chromosomes
- characteristic → what genes code for
- chromosome → where genes are located
- codes → function of genes
- helix → part of "double helix"
- molecule → DNA is a molecule
- parent → source of chromosomes
- dominant → trait expression
- deoxyribonucleic acid → full name of DNA
✔ All keywords were used correctly and logically placed.
---
✔ Final Answer Summary
| Concept | Key Terms Used | Explanation |
|--------|----------------|-----------|
| Chromosomes | Nucleus, 23, Parent, DNA | Found in nucleus; humans have 23 pairs; one from each parent; made of DNA |
| Genes | Chromosome, Codes, Characteristic, Pairs, Dominant | Segments of DNA; code for traits; come in pairs; one may be dominant |
| DNA | Deoxyribonucleic acid, Molecule, 4, Double helix | Full name: deoxyribonucleic acid; a long molecule with 4 bases; shaped like a double helix |
---
📌 Conclusion
The student Dulay, Nasher R. has correctly completed the worksheet using accurate scientific terminology. The answers reflect a solid understanding of:
- The structure of DNA (double helix, four bases),
- The organization of genes on chromosomes,
- The inheritance pattern (from parents, pairs, dominance).
This shows a strong grasp of basic genetics concepts.
✔ Well done! The worksheet is fully and accurately completed.
Parent Tip: Review the logic above to help your child master the concept of dna and genes worksheet.
