A testcross involves
a. two F1 hybrids.
b. an F1 hybrid and an F2 offspring.
c. two parental organisms.
d. an F1 hybrid and the homozygous dominant
parent.
e. an organism of dominant phenotype but
unknown genotype and an organism that is
homozygous recessive for that trait.
Answer: e
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A. seminiferous tubules, epididymis, vas deferens, ejaculatory duct, urethra B. epididymis, seminiferous tubules, vas deferens, urethra, ejaculatory duct C. seminiferous tubules, vas deferens, ejaculatory duct, epididymis, urethra D. epididymis, seminiferous tubules, vas deferens, ejaculatory duct, urethra E. vas deferens, epididymis, seminiferous tubules, ejaculatory duct, urethra
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Indicate whether the statement is true or false
How does stomach acid assist the innate immune system?
a. The acid signals B cells to the site of infection. b. The acid signals T cells to the site of infection. c. The acid creates an inhospitable environment for pathogens to live. d. The acid breaks down the food sources, and the pathogen starves.
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Answer the following statement true (T) or false (F)