In sexually reproducing species, each individual begins life with dna inherited from both parent organisms. in a short essay (100–150 words), apply this idea to what occurs when organisms of two species that have homologous chromosomes mate and produce (f1) hybrid offspring. what percentage of the dna in the f1 hybrids’ chromosomes comes from each parent species? as the hybrids mate and produce f2 and later-generation hybrid offspring, describe how recombination and natural selection may affect whether the dna in hybrid chromosomes is derived from one parent species or the other.

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

Which statements best describe monsoons? check all that apply. they force cool, moist air from oceans to rise. they are winds that blow in the opposite direction of a normal wind. they bring rain in the summer and drought in the winter they increase rainfall in south asia, africa, and australia. they influence precipitation as wind moves near a mountain.

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.