Monohybrid Crosses

The physical expression of a genetic trait is called a

• phenotype

• genotype

The following items are examples of __________.

Items: eye color, hair color, height

• phenotype

• genotype

having two of the same genes for the trait (sometimes called purebred).

• homozygous

• hetrozygous

having two different genes for a trait (sometimes called hybrid).

• heterozygous

• homozygous

An allele whose trait only shows up when no dominant allele is present.

• recessive allele

• dominant allele

Which of the following genotypes would be considered heterozygous?

• BB

• gg

• Ff

Which of the following alleles is homozygous recessive?

• Tt

• tt

• TT

Who is the father of genetics?

• Charles Darwin

• Gregor Mendel

T - tall and t = short

In the punnett square below, what belongs in the missing square

• tt

• Tt

B=brown eyes

b= blue eyes

What is true about these two brothers that have brown eyes:

One has genotype BB the other Bb.

• they have same phenotype and genotype

• they have same phenotype but different genotypes

• they have same genotype but different phenotypes