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
A
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Animals that regulate their body temperature independently of the environment are called
A) heterotherms. B) homeotherms. C) poikilotherms. D) biotherms. E) abiotherms.
Ichthyosaurs were extinct aquatic reptiles distantly related to living lizards. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are
A. homologous. B. adaptations to a common environment. C. examples of convergent evolution. D. Three of the responses above are correct. E. Two of the responses above are correct.
Amphibians evolved directly from which ancestral organisms?
a. fishes b. reptiles c. small mammals d. soft-bodied animals e. marine invertebrates
In vertebrates, which heart chamber supplies oxygenated blood to the body cells?
A) Left ventricle B) Right ventricle C) Left atrium D) Right atrium