Chapter 3 Sections 1 and 2
1. What did Gregor Mendel do to study different characteristics in his genetics experiments?
2. What does the notation BB mean to a geneticist?
3. What is the probability of producing a tall pea plant from a genetic cross between two hybrid
tall pea plants?
4. What does a Punnett square show?
5. What is the meaning of the term genotype?
6. What is the term that refers to the physical characteristics of the organism as studied in
genetics?
7. In Mendel’s experiments, what proportion of the plants in the F2 generation had a trait that had
been absent in the F1 generation?
8. Factors that control traits are called…..
9. What is the term that scientists use to describe an organism that has two different alleles for a
trait?
10. What would the notation Tt mean to a geneticist?
11. What is probability?
12. If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb) what
is the probability that an offspring will have black fur?
13. An organism’s physical appearance is called….
14. The different forms of a gene are called…
15. What do we call an organism that has two identical alleles for a trait?
16. What do we call an organism that has two different alleles for a trait?
17. What do we call an organism that is the offspring of many generations of organisms that have
the same trait?
18. What is a “dominant” allele? What happens when it is present?
19. What principles did Mendel use to predict the percent of offspring that would show a particular
trait?
20. In pea plants, the tall stem allele and the short stem allele are different forms of the same…
21. If A represents the dominant allele for a trait then _____ represents the recessive allele.
22. If each of 5 events is equally likely to occur, then the probability of each individual event
occurring is what percent?
23. Charts used by geneticists to predict the results of genetic crosses are called….
24. If you cross two hybrid Tt pea plants, what percent of the offspring will be Tt?
25. An organism that has two dominant or two recessive alleles is said to be ________ for that trait.
26. An organism can be heterozygous for some traits and _______________ for others.