Two researchers experimentally formed tetraploid frogs by fertilizing diploid eggs from Rana porosa brevipoda with diploid sperm from Rana nigromaculata
When they mated these tetraploid frogs with each other, most of the offspring that survived to maturity were tetraploid, with chromosome sets of both diploid parent species. Based on these results, if this type of tetraploid formed in the wild, what would be the result? (Y. Kondo and A. Kashiwagi. 2004. Experimentally induced autotetraploidy and allotetraploidy in two Japanese pond frogs. Journal of Herpetology 38(3):381-92.) A) The two parent species would interbreed and fuse into one species.
B) The two parent species would recognize each other as mates.
C) The tetraploids would be reproductively isolated from both parent species.
D) The tetraploids would be selected against.
C
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NOTE: The following questions with Punnet squares reflect on a consistent observation that students can commonly use Punnet squares easily, but frequently make mistakes setting them up
STEM/DATA In a population of wild-caught flies, you are focusing on the trait of bristle length. You find that the trait varies between two phenotypes where some flies have long bristles while others have very short bristles. You set up several matings between individual flies from this mixed population and observe the following results in the offspring: Mating # male parent female parent offspring phenotypes 1. long long all long 2. long long all long 3. short short some long, some short 4. short short all short 5. long short all short 6. long short some long, some short 7. short long some long, some short 8. short long all short The male and female offspring have the same chance of having either long or short bristles in each cross. Which phenotype is recessive? A. long B. short
Which of the following statements is false?
a. Cell migration during embryonic development is an example of chemotaxis. b. Embryonic neurons follow adhesive cells as they migrate. c. Cells continue migrating throughout the entire embryonic process. d. Morphogenesis depends upon local growth. e. Controlled cell death can be involved in morphogenesis.
Plants, fungi and bacterial all have:
A. nuclei B. cell walls C. chloroplasts D. lysosomes E. mitochondria
Which hormones produced by the adrenal gland might help to offset some of the symptoms of menopause?
What will be an ideal response?