Biology 11.4

Lakukan tugas rumah & ujian kamu dengan baik sekarang menggunakan Quizwiz!

Anaphase 1 splits apart

Tetrads

Telophase 1 & cytokinesis tetrads

Tetrads-0, chromosomes-4 chromatids-8

Mitosis divides once

To form two cells

Crossing over

exchange of genetic info between segments of homologous chromosomes

Advantages of asexual reproduction

It's faster; large numbers of offspring are produced; and the parent doesn't have to find a mate

Anaphase 2

0 terads 2 chromosomes and 4 chromatids

Anaphase 1

Chromosomes move to opposite ends

Purpose of meiosis

Reduce chromosome number of egg and sperm in half

Metaphase 2

0 terads 2 chromosomes and 4 chromatids

Telophase and cytokinesis

0 terads 2 chromosomes and 4 chromatids and ends with 4 cells

How many tetrads in anaphase 1

0 tetrads

In mitosis

1(2N) cell-> 2(2N) cells

How many tetrads are there in metaphase 1

2 tetrads

How many tetrads are there in prophase 1

2 tetrads

Symbol for diploid

2N

Haw many chromosomes are there in prophase 1

4 chromosomes

How many chromosomes are there in metaphase 1

4 chromosomes

How many chromosomes in anaphase 1

4 chromosomes

Meiosis produces

4 haploid cells that are different

How many chromatids in anaphase 1

8 chromatids

How many chromatids in metaphase 1

8 chromatids

How many chromatids in prophase 1

8 chromatids

Zygote

A fertilized egg

Disadvantages of asexual reproduction

All of the offspring look exactly alike and there is no variation; Ability to adapt to a changing environment is greatly reduced

Advantage of sexual reproduction

All offspring are genetically different from each other

Tetrad

Consists of 4 chromosomes

In meiosis each of the four cells

Contains half the number of chromosomes as the parent

In mitosis each new cekk

Contains the same number of chromosomes as the original cell

Meiosis the four haploid cells contain

Different combinations of chromosome ps from each other

Telophase 1 stage

Diploid number of chromosomes is reduced to the haploid number of chromosomes

Meiosis

Division in which the number of chromosomes per cell is cut in half thought separation of homologous chromosomes

In mitosis the homologous cells

Don't come together to form tetrads

Human body

Egg(23) and sperm(23)~~> zygote (46)

Egg and sperm cells have

Half the number of chromosomes so when added together the zygote will have the proper number

Gametes are said to be

Haploid or 1n

Mitosis the new cells contain

Identical information

Type of cell division that results in cells that are different from the mother cell

Meiosis

Mitosis

Occurs in all cells of the body except sex cells

Process of meiosis

Occurs only in sex cells

Asexual reproduction

Offspring are produced by only one parent each parent passes all of its genes to its offspring

Haploid means

Only 1 of each kind of chromosome

Disadvantages of sexual reproduction

Parent must find a mate; fewer offspring will be reduced and it take longer

Sexual reproduction

Requires two parents each parent passes on half its genes to its offspring; must have a male and female

Gamete

Sex cells

Sexual reproduction always involves

Sex cells fertilization and a zygote

Anaphase 2 splits apart

Sister chromatids

Prophase 2

Spindle fibers form 0 terads 2 chromosomes and 4 chromatids

Prophase 1

Spindle fibers form nuclear membrane goes away chromatin turn into chromosomes tetrads form

Metaphase 1

Tetrads are in the middle

Result of sexual reproduction

The organism will have two sets of chromosomes-- one set form mo and one from dad

In meiosis

The pairs do come together to form tetrads this is how crossing over occurs

Homologous chromsomes

The two copies of each chromosome one coming from the mo and one from the dad

Diploid

There are two of each kind of chromosome in each cell

Meiosis divides twice

To produce a total of 4 cells

One 2n cell ----------

Two 2n cells

Diploid cells contain

Two complete sets of chromosomes

Fertilization

Union of sperm and egg


Set pelajaran terkait

AWS Developer Associate (DVA-C02)

View Set

Ch. 12 AP Environmental Science (Resource Management, Forestry, Land Use, and Protected Areas)

View Set

Membrane Transport: Clinical Case

View Set

Chapter 13: Nursing Care During Labor and Birth

View Set

English 12 B Primavera Final Exam

View Set