Genetics Review

Asexual Reproduction

●1 parent

●Produces identical offspring

●Methods:

○Mitosis

■Grow, repair and replace

■Body Cells

○Binary Fission-splits in half

○Budding-grows out of

Pros

●Fast

●Less Energy

●Many
Offspring

Cons

●No variation

●No genetic
diversity

Sexual Reproduction

●2 parent

●Produces genetically different
offspring

○Increased diversity

○Variation

●Methods:

○Meiosis

■Produces 4 gamete cells
with 23 chromosomes

Pros

●Variation

●Genetic
Diversity

●Traits from
more than 1
generation

Cons

●More Energy

●More Time

●Less
Offspring

Punnett Squares

●Homozygous-same

○BB or bb

●Heterozygous-different

○Bb

●Dominant-covers up the
recessive trait

●Recessive-needs 2 alleles to
see it

●Genotype-alleles present

●Phenotype-physical appearance

○BB or Bb=see the dominant trait

○bb=see the recessive trait

●Each square is 25%

The Environment

●The Environment can have an
impact on you. It can impact
your:

○Life span

○Weight

○Health

●It can NOT impact your:

○Eye color

○Natural hair color

○Blood type

Twins

●Twins are GENETICALLY IDENTICAL
but their BEHAVIOR is different

●Environment plays a role in
their behavior!