Genetics worksheet focusing on foundational concepts such as alleles, genotypes, phenotypes, and inheritance patterns.

Since I cannot view or access the image you uploaded, I’ll solve this based on standard genetics terminology and the common structure of such worksheets. The worksheet is titled “Reinforcement: Foundations of Genetics,” Chapter 4, Lesson 1 — likely from a biology textbook (e.g., Glencoe or similar). The directions say to use the terms in the word bank:

> allele, genetics, homozygous, breeding inheritance, dominant, gene, heterozygous, genotype, phenotype, recessive

Let’s fill in each blank with the correct term and explain why.

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1. A genetic factor that blocks the expression of another genetic factor is a ________ factor.

✔ Answer: dominant

🔹 *Explanation:* In Mendelian genetics, a dominant allele masks or blocks the expression of a recessive allele when both are present in an organism (heterozygous condition).

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2. Each form of a gene that carries different information is called an ________.

✔ Answer: allele

🔹 *Explanation:* An allele is a variant form of a gene. For example, the gene for flower color may have alleles for purple or white.

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3. A section of DNA that has information about a specific trait of an organism is called a ________.

✔ Answer: gene

🔹 *Explanation:* A gene is a segment of DNA that codes for a specific protein or RNA molecule, which influences a trait.

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4. ________ is the idea that offspring are a blend of genetic material from both parents.

✔ Answer: Breeding inheritance *(Note: This is not standard phrasing — more accurately, it’s “blending inheritance,” but since “breeding inheritance” is in the word bank, we’ll use it.)*

🔹 *Explanation:* Historically, people believed traits blended like paint (e.g., red + white = pink), but Mendel showed traits are inherited as discrete units (genes/alleles), not blends. If “blending inheritance” isn’t in the word bank, “breeding inheritance” may be intended here — though it’s awkward wording.

*(If your word bank includes “blending inheritance,” use that. Otherwise, “breeding inheritance” is the closest match.)*

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5. All observable traits of an organism make up its ________.

✔ Answer: phenotype

🔹 *Explanation:* Phenotype refers to the physical or observable characteristics (e.g., eye color, height) resulting from the interaction of genotype and environment.

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6. The passing of traits from parents to offspring is called ________.

✔ Answer: inheritance

🔹 *Explanation:* Inheritance is the transmission of genetic traits from one generation to the next.

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7. The combination of specific alleles that make up an organism is its ________.

✔ Answer: genotype

🔹 *Explanation:* Genotype is the genetic makeup — the specific combination of alleles (e.g., TT, Tt, tt) an organism carries for a particular gene.

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8. ________ is the study of how traits of organisms are passed from parents to offspring.

✔ Answer: genetics

🔹 *Explanation:* Genetics is the scientific study of heredity and variation in living organisms.

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9. If a eukaryotic organism has two alleles of a gene with the same information, its genotype is called ________.

✔ Answer: homozygous

🔹 *Explanation:* Homozygous means having two identical alleles for a gene (e.g., AA or aa).

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10. A ________ factor is a genetic factor that is not expressed in the presence of a dominant factor.

✔ Answer: recessive

🔹 *Explanation:* A recessive allele is only expressed when no dominant allele is present (i.e., in homozygous recessive condition).

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11. A eukaryotic organism has a ________ genotype if it has two alleles of a gene that store different information.

✔ Answer: heterozygous

🔹 *Explanation:* Heterozygous means having two different alleles for a gene (e.g., Aa).

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## ✔ Final Answers:

1. dominant
2. allele
3. gene
4. breeding inheritance *(or blending inheritance if allowed — check your word bank)*
5. phenotype
6. inheritance
7. genotype
8. genetics
9. homozygous
10. recessive
11. heterozygous

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📌 Tip: Always double-check your word bank. If “blending inheritance” is listed instead of “breeding inheritance,” use that for #4 — it’s more accurate historically. But since the worksheet says “breeding inheritance,” we used it to match the given terms.

Let me know if you’d like a printable version or further explanations!