In radishes, long or round are homozygous forms of an incompletely dominant gene, and oval is the phenotype of the
heterozygote. If a long radish is crossed with a round radish, give the genotypic and phenotypic ratios of
the F2 generation. What will be an ideal response?
ANSWER: 1 LL, 2 Ll, 1 ll; 1 long, 2 oval, 1 round
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If an organism is diploid and a certain gene found in the organism has eighteen known alleles (variants), then any given organism of that species can/must have which of the following?
A) at most, two alleles for that gene B) up to eighteen chromosomes with that gene C) up to eighteen genes for that trait D) a haploid number of nine chromosomes E) up to, but not more than, eighteen different traits
Sometimes, the decline of one species threatens the survival of another species. Which scenario is an example of this?
A. Declines in polar bears result in diminished prey populations B. The arrival of sailors on Mauritius island led to the extinction of dodo birds C. Declines in eagle populations due to the accumulation of pollutants in their eggs D. Decline in buffalo caused a drop in native buffalo clover E. Pollution led to declines in the Texas blink salamander population
________ appears to have been the first hominin to use stone tools
A) Homo erectus B) Homo habilis C) Ardipithecus D) Australopithecus
A series of enzymatic steps that fixes carbon dioxide into carbohydrate is called the ________.
A. Calvin-Benson cycle B. Pentose phosphate pathway C. Entner-Doudoroff pathway D. Embden-Meyerhoff pathway