Meiosis and Chromosomal Inheritance (Mid 3)

Question 1

Crossing over usually:

a
creates new alleles

b
creates new combinations of alleles

c
creates new chromosomes

d
recombines alleles from non-paired chromosomes (non-homologous chromosomes)

Answer 1

b
creates new combinations of alleles

Question 2

All of the following are different between meiosis and mitosis except:

a
After meiosis, you end up with half the total number of chromosomes in each daughter cell as were in the original parent cell

b
In meiosis, the copies of each chromosome (sister chromatids) are not exact copies by the end of the process

c
The end product of meiosis is used in reproduction

d
In meiosis, the DNA does not replicate before cell division

Answer 2

d
In meiosis, the DNA does not replicate before cell division

Question 3

Given the information so far, what would you say usually leads to an XY individual being biologically male?

a
The presence of the Y chromosome

b
The number of X chromosomes

Answer 3

a
The presence of the Y chromosome

Question 4

Which of the following events or processes can result in Turner syndrome, Downs syndrome, or Patau syndrome (i.e. an extra copy of a chromosome)?

a
Nondisjunction

b
Crossing-over

c
Independent assortment

d
X inactivation

e
None of the above

Answer 4

a
Nondisjunction