What name is given to the process by which a spindle fibre fails during meiosis and one or more of the gametes produced receives an extra chromosome?
non-disjunction
meiosis
polyploidy
mutation
How many gametes (out of 4) will receive an extra chromosome if the spindle failure occurs during the first meiotic division?
2
4
1
0
If a normal human sperm fertilizes an egg containing an extra copy of chromosome 21, what is the diploid number of the zygote formed?
44
46
47
43
What is meant by the term polyploidy?
an increase in the number of chromosomes by 3 or more times
a decrease in the number of chromosomes by 3 or more times
an addition in the number of chromosomes in gametes
a subtraction in the number of chromosomes in gametes
How are polyploidy plants economically important to farmers?
they are resistant to disease
they are smaller so farmers will have a bigger yield
they make the coffee taste better
they give bigger yields
What name is given to a change which involves a chromosome breaking in two places and a segment of genes dropping out?
Deletion
Duplication
Inversion
Translocation
