Genetics

What is the basic function of chromosomes in the nucleus of a cell?

• to protect the cell
• to transport nutrients
• to release energy from food
• to store genetic information

If a child inherits one dominant allele for dimples (D) and one recessive allele for no dimples (d), the phenotype will be ___________.

• Dd
• DD
• dimples
• no dimples

An organism with a hybrid trait has _________.

• two identical alleles for a trait
• only one allele for a trait
• two different alleles for a trait
• three different alleles for a trait

In rabbits, black fur (B) is dominant over brown fur (b). If a rabbit has black fur, which of the following shows the possible genotype(s). 

• BB and Bb
• bb only
• Black only
• BB and bb

Identical twins are raised by different families. The twins have some traits in common, but some are different.  This is because _______.

• the twin's genotypes are not identical
• certain alleles are different in each twin
• environmental factors can influence traits
• the twins experienced identical environments

A person's environment can affect his or her _______ for certain characteristics, such as skin tone or markings. 

• genotype
• phenotype
• recessive traits
• dominant traits

Purebred is another term for _________

• genotype
• phenotype
• homozygous 
• heterozygous

A dog had a litter of puppies. The puppies all had the same eye color and ear shape as the parents. These two traits are ________.

• altered
• recessive
• environmental
• inherited

Brown eye color (B) is dominant to blue eye color (b). According to this Punnett Square what percentage of offspring will have brown eyes?

• 25%
• 50%
• 75%
• 100%

Red flowers (R) are dominant to white flowers (r).  Using this information give the genotype of the offspring.

• Rr
• rr
• red
• white