Genetics (Heredity) 1 &2

Gregor Mendel's work was the foundation for understanding why

• the results of one genetic cross do not affect the outcome of a second cross.
• sex cells have a half the number of chromosomes as a body cells
• protein synthesis occurs in the cytoplasm
• offspring have traits similar to those of their parents.

For codominant traits, heterozygous organism have a phenotype that shows.

• both alleles
• only the recessive allele
• neither the dominant nor the recessive allelle
• only the dominant allele

An allele whose trait always shows up in an organism when the allele is present is a

• gene
• dominant allele
• recessive allele
• heredity factor

An organism's phenotype is its

• physical appearance
• genetic makeup
• allele combination
• probability of occurring

Each time a coin is tossed, there is a 75% percent chance that the coin will land heads up

• T
• F

The passing of traits from parents to offspring is called codominance.

• T
• F

 Probability is a number that describes how likely it is that an event will happen.

• T
• F

A(n) _____________________ organism is the offspring of many generations that have the same trait.

• Purebreed
• Hybrid
• Allelle
• Gene

A ____________________ is a change in a gene or chromosome.

• Hybrid
• Purebred
• mutation
• DNA

What happened in Mendel's F1 generation with the traits

• tall and dominant
• short and recessive
• tall and codominant
• phenotype and short