Whether a seed is round or wrinkled is due to a single Mendelian gene, with round seeds being dominant to wrinkled seeds. In the progeny of a test cross, _______ of 80 seeds should be round if the unknown round-seeded individual being tested is heterozygous.
A: 0
B: 40
C: 60
D: 20
E: 80
Answer: B: 40
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When atoms gain or lose electrons, they become negatively or positively charged. These negatively or positively charged atoms are known as
A. isotopes. B. ions. C. isomers. D. unstable atoms.
The hydrogen ion gradient across the thylakoid membrane is required to ________________
What will be an ideal response?
“Blood pressure forces fluid out of capillaries
and into the entrance to a kidney tubule.” This is a description of
a. filtration. b. reabsorption. c. secretion. d. elimination. e. excretion
A plant will begin flowering in response to changes in length of daylight, temperature, and light quality. This is an example of which unifying principle of life?
A. Living organisms interact with their environment. B. Populations of organisms evolve from one generation to the next. C. Living organisms maintain homeostasis. D. Living organisms grow and develop. E. Plants conduct photosynthesis.