Nearly all life cycles have both haploid and diploid phases. Usually, the transition from haploid to diploid takes place __________.

When we say that an organism is haploid, we mean that __________.

How many pairs of autosomes do humans have?

Which of the following is a function of mitosis in humans?

Somatic cells in humans contain __________ set(s) of chromosomes and are therefore termed __________.

Spores and gametes are different in that __________.

Humans have 46 chromosomes. This number of chromosomes will be found in __________.

Add labels to the figure that follows, which illustrates a portion of the human life cycle.

A species of rotifer, a small freshwater invertebrate, lost the ability to reproduce sexually millions of years ago. A remarkable feature of its life cycle is the ability to withstand dry conditions. When the rotifer's environment dries out, so does the rotifer, and it can be blown to a new area. Rotifers that land in water will rehydrate and resume an active life. A major pathogen of these rotifers is a species of fungus that cannot survive drying. Some scientists hypothesize that drying rids the rotifers of this pathogen. (a) Design an experimental study to test this hypothesis.