14. Describe the conditions that would cause us to see each of the three basic types of spectra. What do we see in the Sunâs spectrum shown on the opening page of this chapter? 18. Describe the Doppler Effect for light and what we can learn from it. What does it mean to say that radio waves are blueshifted? Why does the Doppler Effect widen the spectral lines of rotating objects? Test Your Understanding Each of the following statements makes some type of claim. Decide in each case whether the claim could be
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A nullizygous organism carries two mutant alleles for the same gene. The mutant alleles are both complete loss-of-function or 'null' alleles, so homozygous null and nullizygous are synonymous. The mutant cell or organism is called a nullizygote.hen an organism is homozygous-dominant for a particular trait, the genotype is represented by a doubling of the symbol for that trait, such as PP. An individual that is homozygous-recessive for a particular trait carries two copies of the allele that codes for the recessive trait.