Which term correctly describes an individual with a pair of the same alleles for a trait?
homologous
heterozygous
homozygous
heterologus
2. Multiple Choice
1.5 minutes
1 pt
An individual with two different alleles for a specific trait is said to be _____________.
homozygous
heterogenous
homogenous
heterozygous
3. Multiple Choice
1.5 minutes
1 pt
Of 12 hamsters just born, 9 have brown fur and 3 have white fur. The trait for white fur is considered to be ________.
recessive
weak
strong
dominant
4. Multiple Choice
1.5 minutes
1 pt
Phenotype refers to the _________ of an individual
genetic makeup
physical appearance
recessive alleles
dominant alleles
5. Multiple Choice
1.5 minutes
1 pt
When the genotype consists of a dominant and a recessive allele, the phenotype will be like the ______________ allele.
dominant
recessive
both
neither
6. Multiple Choice
30 seconds
1 pt
Gregor Mendel developed some basic principles of heredity by ______________.
breeding fruit flies
cutting off the tails of mice
crossing pea plants
growing bacteria in a laboratory
7. Multiple Choice
3 minutes
1 pt
An organism that has two identical genes for a trait is said to be _________.
hybrid for the trait
incompletely dominant for the trait
heterozygous for the trait
homozygous for the trait
8. Multiple Choice
3 minutes
1 pt
Heredity information for traits is located in _____________.
chromosomes on genes
genes of chromosomes
lysosomes in cytoplasm
the mitichondria
9. Multiple Choice
1.5 minutes
1 pt
Which of these would best be described as a phenotype?
blue eyes
mutation
Bb
Tt
10. Multiple Choice
1.5 minutes
1 pt
A pea plant is heterozygous for height (Tt) and it is crossed with a homozygous short (tt) plant. Use a Punnett square to determine the probability of one of their offspring being short.
100%
75%%
50%
25%
11. Multiple Choice
1.5 minutes
1 pt
One dog carries homozygous, long-haired traits (SS), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.
100%
75%
50%
25%
12. Multiple Choice
1.5 minutes
1 pt
How many females are in this pedigree?
3
4
6
7
13. Multiple Choice
1.5 minutes
1 pt
How many of the males in this pedigree show the trait being studied?
2
3
4
6
14. Multiple Choice
1.5 minutes
1 pt
When 2 pea plants heterozygous for height (Tt) are crossed, what is the ratio of the resulting genotypes (TT:Tt:tt)?
1:2:1
2:1:1
0:3:1
0:2:2
15. Multiple Choice
1.5 minutes
1 pt
Look at the Punnett square. If the two parents represented in the Punnett square have four offspring, what does the Punnett square tells you?
two of the offspring will definitely be heterozygous.
one of the offspring will definitely show the recessive trait.
there is a 50% chance for each of the 4 offspring to have the genotype Rr.
there is a greater chance for the offspring to be RR than rr.