Genetics — Cloze Exercise (Dropdowns)

Choose the correct term from each dropdown. Each word must be used only once. The exercise enforces unique choices.

1. A _________ is the physical trait you can see, such as coat colour or horned/polled.

2. The term _________ refers to the alleles an individual carries (their genetic makeup).

3. A _________ is a unit of inheritance made of DNA that controls a characteristic.

4. Different versions of the same gene are called _________.

5. _________ are structures made of coiled DNA which hold many genes.

6. A _________ allele will show its effect even if only one copy is present.

7. A _________ allele only appears when two copies are present (it is hidden by a dominant allele).

8. If both alleles are the same (e.g. BB or bb) the individual is _________.

9. If the two alleles are different (e.g. Bb) the individual is _________.

Tip: You can copy this file into your site. The script ensures each term can only be used once by disabling chosen options in other dropdowns.

Here’s a diagram

Genetics Progression

Genetics Term Progression

Term	Description	Relationship / Progression
Chromosome	A long DNA molecule containing many genes	The “container” for genes
Gene	A segment of DNA that codes for a trait	Located on a chromosome
Allele	Different versions of the same gene	Each gene can have one or more alleles
Homozygous	Having two identical alleles for a gene	A specific combination of alleles
Heterozygous	Having two different alleles for a gene	Another possible combination of alleles
Genotype	The genetic makeup of an organism	The sum of all alleles across genes
Phenotype	The observable traits of an organism	The result of genotype + environment

🐄 🐂🐏🐖

Genetics Pyramid with Icons

👁️🐄 🐂🐏🐖 Phenotype
Observable traits

🧪 Genotype
Genetic makeup (alleles)

🔀 Heterozygous
Two different alleles

⚖️ Homozygous
Two identical alleles

🎨 Allele
Different versions of a gene

🧩 Gene
Segment of DNA coding for a trait

🧬 Chromosome
Contains many genes