Genetics and Heredity The Study of Alleles

What is genetics the study of?

• How traits are passed down from parents to offspring

• The study of ancient genes

• The process of photosynthesis

• The study of minerals

What does homozygous mean?

• When an organism has two identical alleles for a particular trait

• A type of recessive allele

• A type of dominant allele

• When an organism has two different alleles for a particular trait

What is a phenotype?

• The genetic makeup of an organism

• A type of allele

• The physical appearance of an organism resulting from its genotype

• A tool used to predict genetic outcomes

What is a Punnett Square used for?

• To predict the weather

• To measure the height of an organism

• To calculate the age of genes

• To predict the possible outcomes of offspring

What does it mean if an allele is recessive?

• It is always expressed when present

• It determines the genotype alone

• It can mask the expression of a dominant allele

• It is only expressed when paired with another recessive allele

If an organism is heterozygous for a trait, what does it have?

• Only dominant alleles

• No alleles

• Two different alleles

• Two identical alleles

In your own words, describe Genetics and Heredity.