A testcross involves crossing with a(n) _________ individual and is used to determine the _________ of the tested parent
A. homozygous dominant; phenotype
B. homozygous recessive; phenotype
C. homozygous dominant; genotype
D. homozygous recessive; genotype
E. F2 offspring; parental genotype
D
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Non-true-breeding hairy-leaved plants are crossed with smooth-leaved plants.
a. What genotypic and phenotypic ratios would you expect for the potential offspring? b. Suppose you perform such a cross, collect data, and do a chi-square test to aid in data analysis. How many degrees of freedom would there be? c. Suppose your chi-square value is very large (>25). What does this indicate about your experiment and/or hypothesis?
How would a mutation allowing a heterocyte to synthesize more chlorophyll affect the process of nitrogen fixation?
A. There will be a decrease in the amount of ammonia converted to nitrogen gas. B. There will be a decrease in the amount of nitrogen gas converted to ammonia. C. There will be an increase in the amount of ammonia converted to nitrogen gas. D. There will be an increase in the amount of nitrogen gas converted to ammonia. E. There will be no effect because photosynthesis and nitrogen fixation are not directly related.
Which ecosystem service is most closely related to the process of eutrophication?
A. habitat B. pollination C. recreation D. genetic resources E. nutrient cycling
A mutagenic factor that can alter DNA by the loss of a chromosome segment is known as
A. translocation B. crossing over C. deletion D. nondisjunction