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7th Grade Biology: Genetics
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7th Grade Biology: Genetics
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1. Structures in a cell that contain genetic information.
threadlike structures made of DNA molecules that contain the genes
Image: Chromosomes

2. trait that will show up in an organism's phenotype if gene is present
observed trait of an organism that masks the recessive form of a trait
Image: Dominant

3. Two different types
Image: Hybridization/Hybrid

4. the inherited combination of alleles (BB, Tt, aa)

5. Two of the same alleles
Image: Homozygous

6. A segment of DNA on a chromosome that codes for a specific trait
the basic building blocks of heredity
Image: Genes

7. A characteristic passed from parents to their offspring
Image: Inherited trait

8. an organism's inherited PHYSICAL appearance

9. An organism's genetic makeup, or allele combinations.
Image: Genotype

10. an organism with two same alleles for a trait (BB-pure dominant, bb-pure recessive)

11. different forms of the same gene(represented by letters such as TT, Tt, or tt these may be dominant or recessive.

12. distinguishing traits, qualities, or properties
Image: Characteristics

13. A diagram used to predict the probability of how traits could be passed from parent to offpring
Image: Punnett Square

14. a trait that is apparent only when two recessive alleles (recessive by small letters) for the same characteristic are inherited (for example rr or bb) This trait fades into the background and only shows when paired with another recessive allele.

15. small segments of chromosomes with a set of instructions donated by parents to the offspring. These are found on chromosomes.

16. A complex molecule containing the genetic information that makes up the chromosomes.
Deoxyribose nucleic acid
Image: DNA

17. the passing off traits from parent to offspring

18. when an offspring inherits two different dominant alleles or two different recessive alleles and the traits blend. (RW or rw)

19. The passing of traits from parent to offspring
Image: Heredity

20. an organism with two different alleles for a trait (Bb)

21. An organism's physical appearance, or visible traits.
Image: Phenotype

22. a trait observed when at least one dominant allele (represented by a capital letter) for a characterisitc is inherited (for example Rr or RR) This trait will cover up or hide a recessive trait

23. Product of reproduction, a new organism produced by one or more parents
Image: Offspring

24. Different forms of a gene
Image: Alleles

25. The allele that is only expressed when two copies are present
Not expressed when the dominant form of the trait is present
Image: Recessive

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