Mendelian Genetics

How many alleles do you inherit from EACH parent for a specific trait?

• 1

• 2

The study of heredity is called ....

• biology

• genetics

• chemistry

The physical expression of a trait is called the ...

• genotype

• phenotype

Segments of DNA that code for traits are called ....

• genes

• proteins

• alleles

Genotype: TT

• homozygous dominant

• homozygous recessive

• heterozygous dominant

Genotype: Aa

• homozygous dominant

• homozygous recessive

• heterozygous dominant

Cross 2 heterozygous tall pea plants. Tall (T) is dominant to short (t). What fraction of the offspring do you predict will be tall?

• 1/4

• 2/4

• 3/4

• 4/4

Which statement below describes DOMINANT alleles?

• expressed when at least one is present

• only expressed when 2 are present

Which of the following is a PHENOTYPE for flower color in pea plants?

• Pp

• PP

• Purple

The trait or allele that is expressed when only one is present is called the ___________ trait.

• dominant

• recessive