Intro to Genetics
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Created by:
uhlenhopp_tyler on January 2, 2012
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chapter 11
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21 terms
Terms | Definitions |
|---|---|
 recessice | the trait that can only be expressed if BOTH alleles are recessive (It's the Weaker allele Lower case letters ) |
| homozygous | Both alleles for a trait are the Same (BB,bb,TT,tt,RR,rr) |
| Homozygous recessive | both alleles are recessive (bb,tt,rr) |
| homozygous Dominant | both alleles are dominant (BB,TT,RR) |
| heterozygous | Each allele for a trait is different (Bb,Tt,Ss,Rr) (only one combination possible) |
| Genotype | The genetic make up of an organism (A list of the 2 genes alleles for each trait) Bb,tt,Rr,Ss,SS,Qq |
| phenotype | The physical trait expressed in an organism EX.Brown eyes,Calico,long ears. Will always be an adjective. |
| purebred | homozygous |
| hybird | heterozygous |
| probability | likelihood that a particular event will occur |
| Meiosis | cell division to make gametes |
| incomplete dominance | situation in which one allele is not complete dominant over another |
| codominance | situation in which both alleles of a gene contributed to the phenotype of the organism |
| multiple alleles | three or more alleles in the same group |
| polygenic trait | a trait controlled by two or more genes |
| sex linked traits | traits that are inherited with sex chromosomes |
| Meiosis | Ceel division to make gametes(sex cell) This division makes cells with half the number of chromosomes. Cells go from diploid to haploid |
| diploid | Cells with 2 sets of each chromosomes All body cells are diploid Human 2n=46 fruit fly2n=8 carrots 2n=18 |
| haploid | cells with 1/2 the number of chromosomes sex cells(gametes) only Human n=23 fruit fly n=4 carrot n=9 |
| homologous | term used to refer to chromosomes that each have a corresponding chromosome from opposite sex parent |
| gametes | specialized cell involved in sexual reproduction |
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