Introduction to Genetic Variation. Or, lame photo montage thinly disguised as illustration of genetic variation. Key. Haploid gametes ( n = 23 ). Meiosis. Haploid ( n ). Egg ( n ). Diploid (2 n ). Sperm ( n ). MEIOSIS. FERTILIZATION. Testis. Ovary. Diploid zygote (2 n = 46).
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Or, lame photo montage thinly disguised as illustration of genetic variation
Example: individual who is heterozygous at two genes
to red hued hair
to dark hair
to blue eyes
Hair color gene
Eye color gene
During meiosis I, tetrads can line up two different
ways before the homologs separate.
Flower and pod position
Axial (on stem)
Terminal (at tip)
1. Remove male organs
from one individual.
3. Transfer pollen to the
female organs of the individual
whose male organs have
2. Collect pollen from a
RR or Rr
If Dominant gene is present, offspring WILL have the trait without exception