Describe the experimental design Mendel used while researching pea plant traits and explain the general result that
lead him to form his hypothesis about the transmission of “factors” from parents to offspring? What will be an ideal response?
ANSWER: Mendel chose pea parental plants that each had a different distinguishing characteristic,
called a trait. For example, Mendel bred tall pea plants with short pea plants. Plant height is
the trait in this case and has two variations: tall and short. He also bred plants carrying green
seeds with plants having yellow seeds. In this work, seed color is the trait; green and yellow
are the variations of the trait he studied. In these breeding experiments, he wanted to see how
traits such as height and seed color were passed from generation to generation. Mendel kept
careful records of the number and type of traits present in each generation. He also recorded
the number of individual plants that carried each trait. He discovered patterns in the way
traits were passed from parent to offspring through several generations. Based on those
patterns, Mendel concluded that traits such as plant height and seed color are passed from
generation to generation by “factors” that are transmitted from parent to offspring.
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A. Pancreatic fluid; IgE B. Bile; lactoferrin C. Stomach fluid; high pH D. Saliva; lysozyme
Which of the following is (are) NOT a factor(s) that
explain(s) the area effect on island diversity? a. Larger islands have more habitats. b. Smaller islands have more varied and higher elevations. c. Larger islands intercept more colonizers. d. Smaller islands have less complex topography. e. All of these are not factors.
Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that
A) new mutations were frequently generated in the F2 progeny, ?reinventing? traits that had been lost in the F1. B) the mechanism controlling the appearance of traits was different between the F1 and the F2 plants. C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1. D) the traits were lost in the F1 due to blending of the parental traits. E) members of the F1 generation had only one allele for each character, but members of the F2 had two alleles for each character
Which of the following statements is not true?
a. Archaea and bacteria have different membrane lipids. b. Both archaea and bacteria generally lack membraneenclosed organelles. c. The cell walls of archaea lack peptidoglycan. d. Only bacteria have histones associated with DNA. e. Only some archaea use CO2 to oxidize H2 releasing methane