Question 1

A human cell containing 22 autosomes and a Y chromosome is

Accepted Answer

A)  a sperm. 
B)  an egg. 
C)  a zygote. 
D)  a somatic cell of a male.

Question 2

Genetic variation leads to genetic diversity in populations and is the raw material for evolution. Biological systems have multiple processes, such as reproduction, that affect genetic variation. They are evolutionarily conserved and shared by various organisms. Which of the following statements best represents the connection between reproduction and evolution?

Accepted Answer

A)  Plants that use sexual reproduction are rare since this type of reproduction in plants does not contribute to genetic diversity. 
B)  In order to increase genetic diversity for evolution in sexually reproducing organisms, mutations must occur in the zygote after fertilization. 
C)  Since prokaryotic organisms reproduce asexually, there is no mechanism for them to add genetic diversity for evolution. 
D)  Sexual reproduction increases genetic variation because random mutations can be shuffled between organisms.

Question 3

For a species with a haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes based on the independent assortment of chromosomes during meiosis?

Accepted Answer

A)  23 
B)  46 
C)  about 1,000 
D)  about 8 million

Question 4

When chiasmata can first be seen in cells using a microscope, which of the following processes has most likely occurred?

Accepted Answer

A)  meiosis II 
B)  anaphase II 
C)  prophase I 
D)  the separation of homologs

Exam 13: Meiosis and Sexual Life Cycles

A human cell containing 22 autosomes and a Y chromosome is

For a species with a haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes based on the independent assortment of chromosomes during meiosis?

When chiasmata can first be seen in cells using a microscope, which of the following processes has most likely occurred?