1. If non-disjunction occurs during meiosis, what is the possible result?
(select all correct answers)
An egg with an extra chromosome
A sperm with an extra chromosome
A sperm with a missing chromosome
An egg with a missing chromosome
2. Which of the following could be the genotype of a “true-breeding” organism?
RrXX
Dd
CcRr
CCRR
3. When Mendel crossed two dihybrid parents from the F1 generation, what famous phenotype ratio in the F2 generation did he observe?
9:3:3:1
1:2:1
0:4
3:1
4. Which of the following is true of genes and alleles?
(select all correct answers)
Pairs of alleles are found on homologous chromosomes
Alleles code for different versions of the same trait
Both alleles on a chromosome come from one parent
A pair of alleles give the genotype