7th Grade Science Heredity & Genetics Test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Genetics | The study of how traits are inherited. (Example: Blue-eyed mom x blue-eyed dad = blue-eyed baby)
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| Chromosome | Structure in a cell's nucleus that contains genetic material (DNA)
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| Trait | A distinguishing characteristic or quality (Example: eye color, face shape, etc.)
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| Heredity | The passing of traits from parents to offspring. (Example: AA x aa = Aa only)
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| Genotype | The genetic makeup of an organism - how its genes look! (Example: AA, Aa or aa)
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| Phenotype | The physical appearance of an organism due to the genes it has. (Example: Tall or short, Blonde or brunette, etc.)
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| Dominant | A genetic trait that is expressed as long as there is one allele present. (Example: AA or Aa - the 'A' trait is expressed.)
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| Recessive | A genetic trait that is expressed only when there are two alleles present. (Example: aa - the 'a' trait is expressed.)
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| Homozygous (or purebred) | Having two identical alleles for a trait. (Example: AA or aa)
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| True breeding | An individual homozygous for a trait - can only pass one of the forms of the gene to its offspring. (Example: AA can only pass 'A' to its offspring aa can only pass 'a' to its offspring.)
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| Heterozygous (or hybrid) | Having two different alleles for a trait. (Example: Aa)
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| Hybrid | An individual heterozygous for a trait - can pass on either form of the allele. (Example: Aa can pass either 'A' or 'a' to its offspring.)
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| Types of asexual reproduction | binary fission (splitting in two)(ex: bacteria), budding (ex: yeast, hydra), regeneration (ex: planarian, starfish), vegetative propagation (ex: onion, strawberry) budding
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| Nuclueus | Control center of the cell
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| DNA | genetic material which is contained in the nucleus.
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| Chromosomes | Human body cells contain 23 sets made of DNA.
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| How many genes are in each chromosome? | Hundreds to thousands.
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| Genes | Specific sections of DNA that code for traits.
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| Allele | Each trait has 2 parts. Each part is called this. They are classified as either dominant or recessive.
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| Dominant allele | Covers up the alleles that are not as strong.
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| Recessive allele | Weaker alleles.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
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