Get a copy of the Get a copy of the Meiosis and Sexual Meiosis and Sexual

Reproduction Reproduction Outreach Notes.Outreach Notes.

You will have 30 You will have 30 minutes of solo time minutes of solo time

to work on your to work on your outreach notes quietly outreach notes quietly

by yourself. by yourself.

You will now have 15 You will now have 15 minutes to work with your minutes to work with your shoulder partner to fill in shoulder partner to fill in

any gaps you might have in any gaps you might have in your notes. your notes.

If you examined the nucleus of a If you examined the nucleus of a cell of a pea plants, you would cell of a pea plants, you would find that it had 14 chromosomes find that it had 14 chromosomes (7 pairs)(7 pairs)

One chromosome in One chromosome in each pair came from each pair came from the male parent and the male parent and the other from the the other from the

female.female.A cell with two of each kind of A cell with two of each kind of

chromosome is called a chromosome is called a diploiddiploid or or 2N2N

The two The two chromosomes of chromosomes of

each pair in a each pair in a diploid cell (2N) are diploid cell (2N) are

called called

Organisms produce gametes (you Organisms produce gametes (you remember sperm or eggs) that remember sperm or eggs) that

contain one of each kind of contain one of each kind of chromosome.chromosome.

A cell containing one of each A cell containing one of each type of chromosome is called a type of chromosome is called a

haploidhaploid cell cell or or NN

Chromosome Number of Common OrganismsChromosome Number of Common Organisms

OrganismOrganism Body Cell (2N)Body Cell (2N) Gamete (N)Gamete (N)

Fruit FlyFruit Fly 88 44

Garden PeaGarden Pea 1414 77

CornCorn 2020 1010

Leopard FrogLeopard Frog 2626 1313

HumanHuman 4646 2323

ChimpanzeeChimpanzee 4848 2424

Adders FernAdders Fern 12601260 630630

When cells divide by When cells divide by mitosis the new cells mitosis the new cells

have exactly the same have exactly the same number and kind of number and kind of

chromosomes. chromosomes. For example, if mitosis was the only For example, if mitosis was the only means of cell division, in fruit flies means of cell division, in fruit flies the first generation would have 8 the first generation would have 8

chromosomes.chromosomes. 22ndnd GenerationGeneration

161633rdrd

GenerationGeneration

323244thth

GenerationGeneration

6464

Results in new Results in new combinations of combinations of alleles on a alleles on a chromosome.chromosome.

https://highered.mheducation.com/sites/9834092339/student_view0/chapter11/meiosis_with_crossing_over.html

Which of these represents the number of chromosomes in cells before and after the process of meiosis?

A.) n n B.) n 2n C.) 2n n D.) 2n 2n

Which of the following cells are the result of meiosis?

A.) sperm cells B.) liver cells C.) bacteria D.) all the above E.) only B & C

Which of the following steps would not lead to genetic variation?

A.) Crossing over of homologous chromosomes B.) Random alignment of the chromosomes during metaphase C.) The combination of genes from the sperm and egg D.) Alignment of chromosomes during prophase II

Crossing-over occurs during:

A.) anaphase 1 B.) metaphase 1 C.) prophase 1 D.) prophase 2

Which of the chromosomes below are homologous?

A. B. C. D. E.

A cell with a diploid number of 24 undergoes meiosis, how many chromosomes are in each daughter cell?

A.) 6 B.) 12 C.) 24 D.) 48

The overall function of meiosis includes all of the following except _____?

A.) gamete reproduction B.) growth of the cell C.) reduction of chromosome number from 2N to N D.) providing genetic variation to sexually reproducing organisms.

Which of these represents the number of chromosomes in cells before and after the process of meiosis?

A.) n n B.) n 2n C.) 2n n D.) 2n 2n

Which of the following cells are the result of meiosis?

A.) sperm cells B.) liver cells C.) bacteria D.) all the above E.) only B & C

Which of the following steps would not lead to genetic variation?

A.) Crossing over of homologous chromosomes B.) Random alignment of the chromosomes during metaphase C.) The combination of genes from the sperm and egg D.) Alignment of chromosomes during prophase II

Crossing-over occurs during:

A.) anaphase 1 B.) metaphase 1 C.) prophase 1 D.) prophase 2

Which of the chromosomes below are homologous?

A. B. C. D. E.

A cell with a diploid number of 24 undergoes meiosis, how many chromosomes are in each daughter cell?

A.) 6 B.) 12 C.) 24 D.) 48

The overall function of meiosis includes all of the following except _____?

A.) gamete reproduction B.) growth of the cell C.) reduction of chromosome number from 2N to N D.) providing genetic variation to sexually reproducing organisms.