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14 Cards in this Set

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  • Back
How many copies do you need to have of a dominant allele to see the dominant phenotype?
How many copies do you need to have of a recessive allele to see the recessive phenotype?
What do we call the "factors" that Mendel said all organisms have 2 copies of and that passes from one generation to the next?
Principle of Dominance
One factor (allele) in a pair can mask the other allele present. The allele that shows up is called the dominant allele. The allele that is hidden when the dominant allele is present is called the recessive allele.
Principla of Segregation
When gametes form, the 2 alleles responsible for each trait segregate (separate) from each other into different gametes. A gamete will only have one allele for each trait.
Sutton's Chromosome Theory
Genes are carried from parent to offspring on chromosomes.
How many chromosomes do humans have?
46 chromosomes
How many chromosomes in human somatic cells and human zygote?
46 chromosomes each
How many chromosomes in sperm and ova?
23 chromosomes each
Kind of cell division that produces gametes.
Male gametes
Female gametes
ova or egg
Number of gametes
They have half the normal number of chromosomes that body cells have.
Males and females have 22 pairs of chromosomes in common.
Sex chromosomes
23rd pair of chromosomes.
Males are XY. Females are XX.