2/1 Meiosis Pearson HW

What must happen to a chromosome before a cell starts

mitosis?

The single DNA molecule in the chromosome must be replicated.

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 statement best represents the connection between reproduction and

evolution?

Sexual reproduction increases genetic variation because random mutations can be shuffled between organisms.

Homologous pairs of chromosomes are lined up independently of other such pairs during

_____.

metaphase I

Crossing over, resulting in an increase in genetic variation, occurs between

_____.

nonsister chromatids of homologous chromosomes

In human gamete production there is an average of _____ crossover events per chromosome

pair.

2-3

B, C, F, and G

During which process does independent assortment of chromosomes

occur?

during meiosis I only

meiosis; homologous chromosomes

Which of the following statements are TRUE regarding mitosis and

meiosis?

Mitosis results in the formation of two diploid cells.

If synaptonemal complexes are present in a cell undergoing meiosis, what stage is the cell

in?

prophase I

If homologous chromosomes in meiosis are aligned at the equator of the cell, what meiotic stage is the cell in?

metaphase I

metaphase II

The cell is diploid because it contains two sets of chromosomes.

Identify all possible products of meiosis in plant and animal life cycles.

Spores and Gametes

In alternation of generations, what is the diploid stage of a plant that follows fertilization

called?

sporophyte

Diagram II or III

Which of the following types of organisms has both diploid and haploid forms that exist as separate

individuals?

some algae

Which of the following types of cells would be produced by

meiosis?

a haploid animal cell

You find a new species of plant and are studying how it reproduces. You discover a patch of this plant deep in the woods and collect several specimens and bring them in for analysis. For a preliminary analysis, you analyze the nucleotide sequence of the smallest chromosome in each of the specimens and find that each plant's nucleotide sequence is exactly the same. How does this plant likely pass on hereditary information to its offspring?

The plants reproduce asexually by forming clones.

The parent cell that enters meiosis is diploid, whereas the four daughter cells that result are haploid.

Which statement correctly describes how cellular DNA content and ploidy levels change during meiosis I and meiosis II?

DNA content is halved only in meiosis I. Ploidy level changes from diploid to haploid only in meiosis II.