Mendel & Monohybrid Quiz

T2 - Which law states that organisms inherit 2 copies of each gene and donate one to their offspring

• law of independent assortment
• law of segregation
• law of genetic linkage
• law of inheritance

T2 - Recessive alleles may not be expressed because they are

• masked by the dominant allele
• the least common allele in the population
• the most common allele in the population
• less likely to having crossing over

T2 - An allele whose trait always shows up in the organism when the allele is present.

• recessive allele
• dominant allele
• hidden allele
• present allele

T3 - What does heterozygous mean?

• An organism that has the same alleles for a trait (TT or tt)
• An organism that has different alleles for a trait (Tt)
• When neither allele is fully dominant; offspring is a mixture of both
• the different forms of a trait (hair color--> brown, blonde, red

Round seeds (R) are dominant over wrinkled seeds (r). What percentage of the offspring will be round from the following cross?
Rr X Rr

• 100%
• 75%
• 50%
• 25%

What is the genotypic ratio of the offspring?

• 3:1

• 1:3

• 1:2:1

• 2:2

What are the phenotype percentages of the offspring?

(A-Brown fur color; a-white fur color)

• 50 % Brown fur and 50% White fur

• 25 % Brown fur and 75% White fur

• 75 % Brown fur and 25% White fur

• 0% Brown fur and 100% White fur

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%

A heterozygous round seeded plant (Rr) is crossed with a homozygous dominant round seeded plant (RR). What percentage of the offspring will be homozygous dominant?

• 100%
• 75%
• 50%
• 25%

In guinea pigs, the allele for short hair is dominant over the allele for long hair.
B = short 
b = long
What genotype would a heterozygous short haired guinea pig have?

• BB
• bb
• Bb