A testcross consists of
a. a cross of two pure-breeding forms to find out which form of a gene is dominant.
b. a cross between two unknown forms to determine their genotypes.
c. a cross between an offspring and its parent.
d. a cross of an F1 hybrid to an individual that is homozygous recessive.
e. a cross of two F2 individuals to produce an F3 generation.
D
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Of the following anatomical structures, which is homologous to the bones in the wing of a bird?
A) cartilage in the dorsal fin of a shark B) bones in the hind limb of a kangaroo C) chitinous struts in the wing of a butterfly D) bony rays in the tail fin of a flying fish E) bones in the flipper of a whale
Which of the following is a monotreme?
A. kangaroo B. lizard C. opossum D. dog E. duck-billed platypus
Which situation involves a risk to a fetus due to the mother smoking during pregnancy?
A. decreased digestive activity in the stomach of the fetus B. a decrease in the amount of oxygen in the ovary of the mother C. inhalation of secondhand smoke by the fetus D. toxins in the bloodstream of the mother
How does the phosphorylation of galactose differ from the phosphorylation of glucose, mannose, and fructose prior to catabolism?
A. Phosphorylation of galactose requires NADPH to phosphorylate galactose-1-phosphate B. Phosphorylation of galactose requires ATP to phosphorylate galactose-1-phosphate C. Phosphorylation of galactose requires PEP (phosphoenolpyruvate) to phosphorylate galactose-1-phosphate D. Phosphorylation of galactose requires UTP to phosphorylate galactose-1-phosphate E. Phosphorylation of galactose requires TTP to phosphorylate galactose-1-phosphate