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WRITE ABOUT A THEME: INFORMATION In sexually reproducing species, each individual begins
Chapter 24, Problem 11(choose chapter or problem)
WRITE ABOUT A THEME: INFORMATION In sexually reproducing species, each individual begins life with DNA inherited from both parent organisms. In a short essay (100150 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 latergeneration 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.
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QUESTION:
WRITE ABOUT A THEME: INFORMATION In sexually reproducing species, each individual begins life with DNA inherited from both parent organisms. In a short essay (100150 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 latergeneration 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.
ANSWER:When organisms of two closely related species with homologous chromosomes mate and produce F1 hybrid offspring, they transfer genetic information from each parent organism in equal amounts. On average, F1 hybrid offspring receive half of their genetic material, or DNA, from each parent species. The recombination of genes, which is responsible for the variation that allows species to adapt, can also have an effect on the DNA passed on to subsequent generations.
In subsequent generations of F2 and later hybrid offspring the percentage of inh