Punnett Squares
TT, Tt, or tt
What is a genotype?
Passed on from parent to offspring
What are traits?
Artificial selection created larger breeds of chickens.
Why has the size of grocery store chickens doubled over the past century?
When offspring inherit traits from both parents and have a unique genetic code
What is sexual reproduction?
Approximate age at which a human's brain is fully developed
Each parent has _____ alleles
What is 2?
Trait that covers up or hides another trait
What is dominant?
Every cell in an organism has the same number of chromosomes, except _____
What are gametes or reproductive cells?
When offspring are identical to their parents
What is 12 grapes?
What an organism looks like
What is phenotype?
Used to represent a genotype for a recessive trait
What are two lower case letters?
Made of DNA; carries the instructions for a trait and found on chromosomes
What is a gene?
Production of gametes or reproductive cells which contain half the number of chromosomes as body cells
Psychoactive ingredient in marijuana
What is THC?
Percent of the offspring that will be short
What is 25%?
What is brown?
Genes influence an organism's traits by coding for _______________
What are proteins?
Your dog has 78 chromosomes in its body cells; his reproductive cells contain ____ chromosomes
What is 39?
The ratio of teens who smoke marijuana that will become addicted
What is 1 in 6?
Percent of offspring with a heterozygous genotype
What is 50%
True or False. Traits are inherited in separate units.
What is true?
Mutations are ____________ harmful.
What is 46?
Drug classification of nicotine
What is a stimulant?