Transcript Sexual vs. Asexual Reproduction

Genetics and Heredity
EPISD Standards Based Curriculum 2013-2014
GENE – code for a specific
trait
Image taken from:
http://science.howstuffworks.co
m/life/cellularmicroscopic/cell7.htm
EPISD Standards Based Curriculum 2013-2014
DNA - genetic material that
carries information about the
organism
Image taken from
http://www.medicalde
vicepatentattorneys.co
m/2012/12/articles/dis
cussion-on-the-genepatent-debate/
EPISD Standards Based Curriculum 2013-2014
CHROMOSOME – a threadlike
cellular structure that carries
genetic information
Image taken from
http://www.futurity.o
rg/tag/chromosome/
EPISD Standards Based Curriculum 2013-2014
NUCLEUS – control center of
the cell that direct’s the cells
activities
Image taken from
http://www.buzzle
.com/articles/cellnucleus-structureandfunctions.html
EPISD Standards Based Curriculum 2013-2014
CELL – the basic unit of structure
and function in living things
Image taken from
http://www.phoeni
x5.org/glossary/ce
lls.html
EPISD Standards Based Curriculum 2013-2014
Image taken from
http://education.technyou.
edu.au/book/export/html/
91
• There are 100 trillion
cells inside the average
human. Each nucleus
contains 46 chromosomes
or 23 pairs
EPISD Standards Based Curriculum 2013-2014
• One
chromosome in
every pair comes
from each parent
•The
chromosomes
contain tightly
coiled strands
of DNA
•Genes are
sections of DNA
that contain the
codes for building
proteins.
Sexual vs. Asexual
Reproduction
TEKS 7.14 The student knows that reproduction is a characteristic of
living organisms and that the instructions for traits are governed in
the genetic material.
A.define heredity as the passage of genetic instructions from one
generation to the next generation.
B.compare the results of uniform or diverse offspring from sexual or
asexual reproduction. Supporting Standard
C.recognize that inherited traits from individuals are governed in the
genetic material found in genes within chromosomes in the
nucleus. Supporting Standard
EPISD Standards Based Curriculum 2013-2014
Sexual Reproduction
EPISD Standards Based Curriculum 2013-2014
vs
Asexual Reproduction
Sentence Stems
 One characteristic of asexual reproduction is…
 One characteristic of sexual reproduction is…
 One characteristic sexual and asexual reproduction
have in common is…
EPISD Standards Based Curriculum 2013-2014
Advantages/Disadvantages
Asexual Reproduction
Sexual Reproduction
 Advantages:
 Advantages:
 Disadvantages:
 Disadvantages:
EPISD Standards Based Curriculum 2013-2014
Define Heredity
 Look back at your definition of heredity from the
Engage activity.
 Do you still agree with that definition?
 Or would you like to modify it?
EPISD Standards Based Curriculum 2013-2014
Where is the genetic material
stored?
 Think back on the models that you made during the
Explore investigations.
 Where was the genetic material found?
 What happened when there were two different genes?
EPISD Standards Based Curriculum 2013-2014
Sexual Reproduction
 Sexual Reproduction
 Two parents
 Sex cells: sperm and egg
 Sperm and egg join= fertilization
 Offspring look different from
parent
EPISD Standards Based Curriculum 2013-2014
Asexual Reproduction
 Asexual Reproduction
 One parent
 No sex cells
 Offspring produced by cell division
 Offspring identical to parent (same
DNA)
 Several types in plants and animals
EPISD Standards Based Curriculum 2013-2014
Types of Asexual
Reproduction
 Binary Fission
 Organism divides in half
 Two identical daughter cells
produced
 Daughter cells are half the parent’s
size
 Daughter cells grow, then divide too
 Ex: bacteria
EPISD Standards Based Curriculum 2013-2014
Types of Asexual
Reproduction
 Budding
 Small bud grows out of parent cell
 Two different sized cells made (with
identical DNA)
 Bud breaks off and grows
 Ex: yeast and hydra
EPISD Standards Based Curriculum 2013-2014
Sexual vs. Asexual Reproduction
Type of
Reproduction
Sexual
Asexual
Advantages
Disadvantages
diversity of offspring
requires a mate to
reproduce
offspring less like to have
mutations show up
slower population growth
does not require a mate
for reproduction to take
place
lack of diversity in
offspring
can increase population
rapidly
reproduce genetically
identical to parents, the
offspring inherit any
mutations of the parents
EPISD Standards Based Curriculum 2013-2014
Video Clips taken from
youtube.com:
Sexual Reproduction:
http://www.youtube.com/watch?v=tFZeyFbBLXE
Asexual Reproduction:
http://www.youtube.com/watch?v=jk2RJm5RBEk
EPISD Standards Based Curriculum 2013-2014