Mendel's first experiment crossed true-breeding plants with different versions of the hereditary factor for a trait. which of the following best describes mendel's results? a. all of the f1 offspring expressed the same version of the trait. b. the f1 offspring expressed a combination of the traits of the parents. c. about 25% of the f1 offspring showed the recessive trait. d. about 25% of the f1 offspring showed the dominant trait.

Considering the yellow and green pea color phenotypes studied by gregor mendel: a. what is the biochemical function of the protein that is specified by the gene responsible for the pea color phenotype? (1 point) b. a null allele of a gene is an allele that does not specify (or encode) any of the biochemical function that the gene normally provides (in other words, either no protein at all or only non-functional protein is produced from it). of the two alleles, y and y, which is more likely to be a null allele? (1 point) c. in terms of the underlying biochemistry, why is the y allele dominant to the y allele? (2 points) d. why are peas that are yy homozygotes green? (1 point) e. the amount of protein produced from a gene is roughly proportional to the number of functional copies of the gene carried by a cell or individual. what do the phenotypes of yy homozygotes, yy heterozygotes, and yy homozygotes tell us about the amount of sgr enzyme needed to produce a yellow color? explain your reasoning. (2 points)

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above