Genetics/Monohybrid Cross

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

• genotype
• allele
• hybrid
• trait

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%

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

• GG
• Gg
• gg
• green

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

In this example, the child displays the ________ trait.

• dominant
• recessive 

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

• 1
• 2
• 3
• 4

An allele (T) for tongue-rolling is dominant over non-tongue rolling. What would be the genotypes of both parents if all of the offspring in the F1 generation are non-tongue rolling?

• TT X Tt

• Tt X tt

• tt X tt

• TT X tt

In garden pea plant, long stem is dominant over short stem. How many percent will be short stem garden pea plants that may appear in the first filial generation if both parents are heterozygous for the given trait?

• 25% short stem pea plant

• 50% short stem pea plant

• 75% short stem pea plant

• 100% short stem pea plant

Who is the father of genetics?