Bio Chapter 8

A human somatic (body) cell has____ chromosomes

46 and 23 pairs

why are no two gametes exactly alike genetically

Because each gamete has a different combination of parental chromosomes that is the result of both crossing over and independent assortment

In humans, meiosis produces cells that are _____

Haploid, called gametes

while working in a medical clinic, you are asked to assist in the care of a 16 year old female patient who has not yet begun menstruating. you also notice she is small in stature and has a wider than average neck you suspect that she might have

turner syndrome

A human skin cell, in prophase of mitosis, contain in total?

92

what is true for meiosis II

It results in the production of Four Haploid cells

Plant cells divide by______

mitosis followed by cyto kinesis by cell plate formation

If a cell begins meiosis with a 2n(diploid) number of 16, how many chromosomes are there in the cell at ana phase 1

16

if a cell begins meiosis with a 2n (diploid) number of 16, how many chromosomes are there in the cell at prophase I

16

if a cell begins meiosis with a 2n(diploid) number of 16, how many chromosome are there in each cell at metaphase II

16

if a cell has 30 chromosomes before mitosis, how many does each daughter cell have afterward

30

during which phase of the cell cycle does DNA replication occur

S

In Meiosis II

Sister Chromatids are separated into different daughter cells

during meiosis, homologous chromosomes separate at ___

anaphase 1

Homologous chromosomes

carry the same gene

crossing over between homologous chromosomes normally occurs

during prophase 1

how does meiosis generate genetic diversity

homologous chromosomes cross over during prophase I and during metaphase I, chromosomes align randomly

a karyotype

is a picture of chromosomes arranged in ordered pairs

the number of chromosomes found in a somatic eukaryotic cell

is constant during its entire life

which of the following is true about prophase I

it involves pairing up of homologous chromosomes

Which of the following allows sexual reproduction to occur generation after generation

meiosis

diploid cells become haploid during

meiosis I

Which of the following terms describes a failure of chromosomes to sort properly

nondisjunction

The sex of a human fetus is determined by the

sex chromosome found in the sperm

which of the following is the last stage of mitosis

telophase