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science C test
science griffin
| Question | Answer |
|---|---|
| chromosomes | a doubled rod of condensed chromatin that contain DNA and genetic information |
| codominance | a condition in which neither of two alleles of a gene is dominant or recessive |
| hybrid | an organism that has two different alleles for a trait also called heterozygous |
| traits | a characteristic that an organism can pass onto its offspring through its genes or is inherited |
| meiosis | the process that occurs in sex cells by which the number of chromosomes is reduced by half |
| multiple allele | three or more forms of a gene that codes a single trait |
| phenotype | an organism's physical appearances or visible traits |
| allele | the different forms of a gene |
| carrier | a person who has one recesive allele for a trait and one dominant allele, but doesn't have the trait |
| dominant | an allele whose trait always shows up in the organism when the allele is present |
| genotype | an organisms genetic makeup or allele combination |
| heredity | the passing of traits from parents to offspring |
| heterozygous | having two different alleles for the same trait |
| pedigree | a chart or "family tree" that tracks which members of a family have a particular trait |
| probability | the likelihood that a particular event will occur |
| Punnett Square | a chart that shows all the possible combinations of alleles that can result from a genetic cross or the possible genetic combinations of parents compared to their offspring |
| recessive | an alllele that is masked when a dominant allele is present--- the weaker gene that is hidden when a dominant gene is present |
| purebred | an organism that always produces offspring with the same form of a trait as the parent |
| sex linked genes | a gene that is carried on the X and Y chromosome |
| sex linked traits | a trait that is carried on the X and Y chromosome |
| Describe the difference of genotype and phenotype. | genotype is an organisms genetic makeup and phenotype is an organisms physical traits. |
| How does masking occur? | Dominant allele masks the recessive allele. |
| What is codominance and give a descriptive example of a codominant trait. | codominance- the alleles are neither dominant nor recessive. As a result, neither allele is masked or hidden in offspring. example, In Erminette chickens, the alleles for black and white feathers are codominate. |
Created by:
lmajor
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