VOCABULARY
A characteristic passed from parent to offspring.
Inherited Trait
The molecule that contains genetic information.
DNA
Brown eyes (B) are dominant over blue eyes (b). What phenotype results from Bb?
Brown Eyes
Cell division used for growth and repair.
Mitosis
The scientist most associated with natural selection.
Charles Darwin
Differences among individuals of the same species.
Variation
The structures found in the nucleus that contain DNA.
Chromosomes
In a Bb × Bb cross, what percentage of offspring are bb?
25%
Cell division that produces sperm and egg cells.
Meiosis
Natural selection occurs when organisms with advantageous traits do what?
Survive and Reproduce More Successfully
The basic unit of heredity.
Gene
A dominant allele is represented by what type of letter?
Capital Letter
In a Bb × bb cross, what percentage of offspring have brown eyes?
50%
How many chromosomes are found in human gametes?
23
True or False: Organisms develop traits because they need them.
False
A trait that helps an organism survive and reproduce.
Adaptation
If B = brown eyes and b = blue eyes, what is the genotype of a heterozygous individual?
Bb
What term describes genotype BB?
Homozygous Dominant
How many chromosomes are found in most human body cells?
46
A snowy environment favors white rabbits over brown rabbits. Which rabbits are most likely to survive?
White Rabbits
The process where humans choose organisms with desirable traits for breeding.
Artificial Selection
In DNA, Adenine pairs with _______.
Thymine
What term describes genotype bb?
Homozygous Recessive
Which process creates genetic variation: mitosis or meiosis?
Meiosis
Variation is important because it increases the chance that some individuals will _____ during environmental change.
Survive