law of segregation |
Mendels’ first law. The Law of Segregation states that the two alleles of a given gene will be separate from one another during gamete formation (meiosis). |
law of independent assortment |
the law that states that genes separate independently of one another in meiosis when forming gametes |
dominant allele |
an allele whose trait always gets expressed (in the phenotype) in the organism when the allele is present |
recessive allele |
an allele that is masked (in the phenotype) when a dominant allele is present |
codominance |
Situation in which the phenotypes produced by both alleles are completely expressed (red flower crossed white flower to produce red & white spotted flower) |
incomplete dominance |
when one allele is not completely dominant over the other allele (red flower crossed white flower to produce PINK flower) |
sex-linked trait |
trait related to a gene that is found on the X or Y chromosomes |
polygenic traits |
traits controlled by two or more genes (ie. human skin color) |
multiple alleles |
genes that have more than two alleles (ie. human blood types) |
probability |
the likelihood that a particular event will occur |
Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of |
A. Each of their sons will have hemophilia. B. None of their daughters will have hemophilia. C. Their sons have a 25% chance of having hemophilia. D. There is a 50% chance that their daughters will have hemophilia. |
Mendel’s Laws
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