Monohybrid Crosses

In watermelons, green rinds (G) are dominant to striped rinds (g).  What is the genotype of a heterozygous green watermelon?

• GG
• Gg
• gg
• green

In cacti, long arms (A) are dominant to short arms (a).  Suppose 2 heterozygous cacti are crossed.  What percentage of their offspring are expected to have short arms?

• 0%
• 25%
• 75%
• 100%

One of the two forms of a gene is called a(n)

• genotype
• allele
• hybrid
• trait

When a person has two different alleles for a gene, they are said to be

• heterozygous
• homozygous

A __________ allele always shows up in an organism when the it is present.

• dominant
• hybrid

How many alleles (letters) do each person carry for a trait?

• 1
• 2
• 3
• 4

Long tongues (T) are dominant to short tongues in green tree frogs.  What is the probability that two frogs that are heterozygous for long tongues could produce offspring with short tongues?

• 100%
• 75%
• 50%
• 25%

When a person has two different alleles for a gene, they are said to be

• heterozygous
• homozygous

The passing on of physical or mental characteristics genetically from parent to offspring.

• mitosis
• heredity
• hydrogen bonds
• chromosomes

The genetic makeup of the flower is _____________

• red
• heterozygous
• homozygous dominant
• homozygous recessive