Transcript 500 100 How Organisms Grow The Stages of Life Inherited

How
Organisms
Grow
The
Stages of
Life
Inherited
Traits
Mixed
Mixed
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In asexual reproduction, how many
parents are needed?
one
________parents are required for
sexual reproduction.
two
Reproductive cells are formed
through ____________.
meiosis
In sexual reproduction, the baby’s
cells have ______________from
both of her parents’ cells.
chromosomes
All animals go through
_____________a process in which
cells make exact copies of
themselves.
mitosis
All animals have their own type of
life cycle, a process in
which,________________________
_____________________________.
A baby is born or hatched, unable to
reproduce, and grows to become a
reproducing adult.
Direct development
is,____________________________
_____________________________.
When young animals who have the
same shape as their parents grow up.
Name an insect that goes through
incomplete metamorphosis.
The grasshopper
Describe how an insect in the larva
stage behaves (acts) compared to an
insect in the pupa stage.
Insects in the larva stage spend all of
their time searching for food and
eating food because they have a
huge appetite.
Insects in the pupa stage don’t do
anything because they are putting all
of their energy into changing into an
adult.
What is metamorphosis?
Describe both types of
metamorphosis.
Metamorphosis is a type of life cycle that insects go through. Their bodies change
form every time they enter a new stage.
In complete metamorphosis, there are four stages: egg, larva, pupa, and adult.
In incomplete metamorphosis, there are three stages: egg, nymph, and adult.
What does the term “inherited trait”
mean?
An inherited trait is something that
you inherit from your parents (eye
color, hair color, height).
Brown eyes are an example of,
________________________.
A dominant trait
Blue eyes are an example of,
_______________________.
A recessive trait
Genes (which can be found on
chromosomes) have the DNA codes
for __________________________.
Inherited traits
How many parents need to have the
DNA code for brown hair (dominant
trait) for their baby to have brown
hair?
How many parents need to have the
DNA code for blonde hair (recessive
trait) for their baby to have blonde
hair?
For brown hair: one parent
For blonde hair: two parents
Explain how the nucleus of a cell
gets ready for mitosis.
It makes exact copies of its
chromosomes.
A ____________is formed when
two cells (from the mother and
father) join together.
zygote
Which 2 of the following are not
inherited traits?
A. Hair color
B. height
C. balance
D. a love of books
C.
balance
D. a love of books
What are the four basic steps of
mitosis?
1. Chromosomes are copied.
2. The copied chromosomes
and the older chromosomes line
up and attach to each other.
3. The copies and the older
chromosomes detach, and the
outside of the cell pinches in
near the center.
4. The new cell separates.
If a body cell has 20 chromosomes,
how many chromosomes would the
reproductive cell have? Use
numbers to explain your answer.
Reproductive cells always have half
the number of chromosomes that the
body cells have. 10 is half of 20, so
this reproductive cell would have 10
chromosomes.
Gregor Mendel studied inherited
traits in the 1850s and 1860s.
One of the terms he used was,
“factors”. What do we call these
“factors” today?
genes
How many chromosomes do
human body cells and
reproductive cells have?
Body cells 46
reproductive cells 23
Describe the process of molting.
An insect that goes through incomplete
metamorphosis goes through a “nymph”
stage. During this stage, its body grows larger
and larger, so its shell (exoskeleton) must be
shed so a larger one can replace it.
Compare the life cycle of a
grasshopper with that of a
butterfly.
The grasshopper goes through
incomplete metamorphosis: egg,
nymph, adult.
The butterfly goes through
complete metamorphosis: egg,
larva, pupa, adult.
Describe the expected results of a
cross between a dark brown
rabbit and a light brown rabbit.
1. If a dark brown rabbit has 2 genes for
dark brown fur, all the offspring in the first
generation will have dark brown fur.
2. If the dark brown rabbit has 1 gene for
dark brown fur and 1gene for light brown
fur, half of the offspring in the first
generation will be light brown and half will
be dark brown.