Transcript Cells Chapter 4 Review Powerpoint

Chapter 4 review
Patterns of Heredity
Who is the father of Heredity?
Gregor Mendel
What type of plants did
Mendle work with?
Pea Plants
What do genes tell us?
Our inherited traits
What are alleles?
The various forms of the
same gene.
What is a phenotype?
It describes the actual
characteristics that can be
observed - like height.
What is a genotype?
Is the name of the genes
an organism has.
When do dominate or
recessive genes show up?
Dominant traits are expressed
even if only one copy of the
allele codes for them. (Dd) If a
trait is recessive, it is
expressed only if both alleles
code for it (dd).
What is it called when a
gamete for each parent
combines to form a new cell?
Sexual reproduction
If an allele is expressed at Dd
is it dominate or recessive?
dominate
What does a Punnet Square
show?
It is a representation of how
alleles might combine
What are the chances that a
human offspring will have an
XY genotype?
50% or a ratio of 1:2
How many chromosomes do
you have?
46
If a 2n human cell has 46
chromosomes, how many
chromosomes does a male
gamate have?
23
My holiday gift to you…
No, not an ipod
No, not a iphone
Yes, a take home test!