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ch 9// exam 2 review
Question | Answer |
---|---|
What is inheritance? | traits that are passed down |
Who is Gregor Mandel? | He came up with three principles of genetics: Law of Dominance, Law of segregation, Law of independent assortment |
What is heredity ? | the transmission of traits from one generation to the next |
What are genetics? | the scientific study of heredity |
what is a character? | a heritable feature that varies among individuals |
What is a trait ? | variant of a charcter |
How did Mandel control his experiment ? | he pollinated the plants by hand and always made sure of the parentage of his new plants |
What is the P generation ? | the parental plants |
What is the F1 generation? | the hybrid offspring of the p generation |
What is the F2 generation? | a cross of the F1 generation |
What are alleles? | genes |
What are homozygous alleles? | two identical alleles for a gene ex. HH or hh |
What are heterozygous alleles? | two different alleles for a gene ex. Hh |
What is a dominant allele? | Allele that is expressed over recessive |
What is a recessive allele? | Allele that isn't expressed in heterozygous organism |
What is the law of segregation? | The two alleles for each gene separate during gamete formation |
What is a monohybrid cross? | Punnet square with one gene |
What is a dihybrid cross? | Punnet square with 2 genes |
What is a phenotype? | physically expressed traits |
What is a genotype? | genetic code of traits |
What is the locus? | The position of a gene on a chromosome |
What is the law of independent assortment? | Alleles of genes on nonhomologous chromosomes assort independently during gamete formation |
What is a test cross? | The individual with the unknown genotype is crossed with a homozygous individual expressing the recessive trait |
What is a wild type trait? | the phenotype for a character most commonly observed in natural populations |
What is a sex linked gene? | A gene located on either sex chromosome ex: color blindness |
What is hemophilia ? | sex-linked recessive disorder defined by the absence of one or more of the proteins required for blood clotting |
What is co-dominance? | 2 dominant alleles are expressed at the same time in the heterozygote's phenotype |
What is incomplete dominance ? | One allele of a pair is not dominant over its partner so a new heterozygous phenotype emerges |