Genetics Practice Problems #4
Name:____________________ Period:_____
1. If a black heterozygous guinea pig is crossed with a homozygous white guinea pig with the
genotype bb, what is the probability that the offspring will be white?
2. If two hybrid tall pea plants are crossed, what is the probability that the offspring will have the
tall phenotype?
3. The different forms of a gene are called _________________.
4._______As a result of meiosis, the number of chromosomes
a. is reduced by half in sex cells.
b. stays the same in sex cells.
c. is doubled in sex cells.
d. is quadrupled in sex cells.
5. ________The purpose of mitosis is to______________
a. make sex cells.
b. make gametes.
c. create identical cells.
d. create different cells.
6. Both parents have genotype Rr. What genotype could the offspring have?
7. A true-breeding tall pea plant is crossed with a true breeding short pea plant all the offspring
are tall. What is the most likely genotype of the offspring assuming a single gene trait?
8. If two white guinea pigs with genotype bb are crossed, what is the probability that the
offspring will be white?
9. _____Which of the following statements about DNA is true?
a. DNA is single-stranded.
c. DNA contains uracil.
b. DNA has the sugar ribose.
d. DNA contains thymine.
10. One parent has genotype DD and the other has dd. All of the offspring will be __________.
11. In guinea pigs, the allele for short hair is dominant. What genotype would a heterozygous
short haired guinea pig have? _______What genotype would a purebreeding short haired
guinea pig have? _______ What genotype would a long haired guinea pig have? ________