In both Mitosis and Meiosis, the nuclear membrane breaks down as the DNA organizes into chromosomes! They are both associated with cytokinesis. The fundamental sequence of events in mitosis is the same as in meiosis (in meiosis it happens twice).
Nondisjunction- When chromosomes may fail to separate during meiosis.
Recessive Genes- Recessive is defined as a gene with characteristics which are not as strong as those on a dominant gene.
Dominant genes- The powerful gene. Example, brown eyes, dark hair, and skin color.
Somatic cells- Your body cells. Cells you can damage by smoking or such.
Germ cells-a cell containing half the number of chromosomes of a somatic cell and able to unite with one from the opposite sex to form a new individual; a gamete.
Karyotype- the number and visual appearance of the chromosomes in the cell nuclei of an organism or species.
- Also known as XXY syndrome!
- NOT inherited
- Random genetic error after conception
- Low testosterone and reduced muscle mass, facial hair.
- Most males with this condition produce little to no sperm
- Also called Trisomy 21
- A genetic chromosome 21 disorder
- Intellectual delays
- causes a distinct facial appearance, intellectual disability, developmental delays, and may be associated with thyroid or heart disease.
This is what they see with a red-green color deficiency
- Also called color vision deficiency
- Disability to distinguish colors
- Often inherited
- Can be caused by certain eye diseases and medications
- No cure but treatment can help
- A chromosomal disorder in which a female is born with only one X chromosome
- Only 200,000 cases a year in the US
- Missing or incomplete sex chromosome
- Symptoms include short stature, delayed puberty, infertility, heart defects, and certain learning disabilities.
- Treatment involves hormone therapy. Fertility may be necessary for women who want to become pregnant.