Meiosis #1

Meiosis

• the process that occurs in male and female reproduction systems to produce or form sex cells (sperm and egg)

• A cell division process of reducing the number of chromosomes.

Multiple Choice

Which statements explain how a mutation in a somatic cell is different from a mutation that occurs in gametes?

• Somatic cell mutations occur in cells that give rise to gametes.

  Gamete mutations occur in cells that result in apoptosis.

• Somatic cell mutations are maintained in the gene pool.

  Gamete mutations are expelled from the gene pool.

• Somatic cell mutations are generally not passed to offspring.

  Gamete mutations are usually passed to offspring

• Somatic cell mutations will not be expressed by the individual that contains the mutation.

  Gamete mutations will be expressed by the individual.

Multiple Choice

Cell mutations within a DNA sequence are —

• unnatural events that are harmful to genetic diversity

• unnatural events that always affect the phenotype

• natural events that produce genetic diversity in organism

• natural events that always affect the phenotype

Multiple Choice

Any change in the sequence of DNA nucleotides is called a —

• transgenic shift

• monohybrid trait

• single genotype

• mutation

Know the important events of Meiosis, their significance and the key differences between Meiosis I and Meiosis II

I Will...

Review the process of Meiosis and its significance to sexual reproduction

We Will...

Win for the Day!

​sexual vs asexual

meiosis vs mitosis

gametes/germ cells vs somatic cells

​

​Gametes

​Homologous pairs - 2 chromosomes (one from mom, one from dad) that have the same length and general appearance

Diploid (2n) - cell has TWO copies of each chromosome (1 from each parent)

46 chomosomes

Haploid (n) - has ONE copy of each chromosome

22 autosomes and 1 sex chromosome

sperm (x or y)

egg (always x)

​Diploid (2n)

​Haploid (n)

​(through DNA replication)

​maternal + paternal =
homologous pairs

​homologous chromosomes = 2 sister chromatids

1 sister chromatid = duplicated chromosomes

​Haploid (n)

​Haploid (n

​chromatid

​0

​

​Sister Chromatids

​A cell division process of

reducing the number of

chromosomes.

​Start = Diploid (2n)

​Homologous pairs of chromosomes - split during Meiosis I

​End - haploid (n)

Multiple Choice

During which stage are homologous chromosomes separated?

• anaphase of Meiosis I

• during the process of Meiosis II

• anaphase of Meiosis II

• after the completion of Meiosis II

Multiple Choice

During which stage does the process of Crossing-over occur?

• During the completion of Meiosis II

• Prophase of Meiosis I

  (Prophase I)

• During the start of Meiosis II

• Prophase of Meiosis II

  (Prophase II)

Multiple Choice

The process of Meiosis I starts with a _______ parent cell and ends with two _______ daughter cells.

• diploid (2n); haploid (n)

• diploid (2n); diploid (2n)

• haploid (n); haploid (n)

• haploid (n) ; diploid (2n)

Know the important events of Meiosis, their significance and the key differences between Meiosis I and Meiosis II

I Will...

Review the process of Meiosis and its significance to sexual reproduction

We Will...

Win for the Day!

Some text here about the topic of discussion

​Start - haploid (n)

sister chromatids - split during Meiosis II

​

​Gametes

​End - haploid (n)

​

​Gamete

​

​

​Gamete

​Gamete

​End: Haploid(n)

Multiple Choice

During which stage are sister chromatids separated?

• anaphase of Meiosis I

• during the process of Meiosis II

• anaphase of Meiosis II

• after the completion of Meiosis II

Multiple Choice

The process of Meiosis II starts with 2 _______ daughter cells and ends with 4 _______ sex cells.

• diploid (2n); haploid (n)

• diploid (2n); diploid (2n)

• haploid (n) ; haploid (n)

• haploid (n) ; diploid (2n)

Multiple Choice

A diploid cell contains __ chromosomes, while a haploid cell contains __ chromosomes.

• 46 ; 46

• 46 ; 23

• 23 ; 46

• 23 ; 23

Know the important events of Meiosis, their significance and the key differences between Meiosis I and Meiosis II

I Will...

Review the process of Meiosis and its significance to sexual reproduction

We Will...

Win for the Day!

Some text here about the topic of discussion