Genetics Interactive QUiz

A cross is made between two parents, both with genotype Aa. What is the probability that an offspring will have the genotype aa?
1. 1/8
2. 1/4
3. 1/2
4. 3/4
In Guinea pigs, black hair is dominant over white hair. If a homozygous black guinea pig is crossed with a white guinea pig, the offspring will be
1. All white
2. All black
3. Half white and half black
4. 3/4 black and 1/4 white
In the fruit fly, gray body (G) is dominant over black body (g). Two gray flies were mated. 158 gray bodied flies and 49 black bodied flies were produced. The parents probably were:
1. GG x GG
2. Gg x Gg
3. GG x Gg
4. Gg x gg
Genes that are located on the sex chromosomes are referred to as ______ traits.
1. sex-linked
2. co dominant
3. incompletely dominant
4. weird
A dominat trait is _____________________.
1. The letters used to indicate the presence of a gene
2. Members of a gene pair that are different
3. Physical appearance
4. Expressed if present
A recessive trait is _______________________.
1. The letters used to indicate the presence of a gene
2. Is masked by the dominant gene
3. Members of a gene pair that are
  different
4. Physical appearance
The genotype is ________________.
1. masked by the dominant gene
2. Members of a gene pair that are different
3. Physical appearance
4. The letters used to indicate the
  presence of a gene
Heterozygous is __________________.
1. Is masked by the dominant gene
2. Members of a gene pair that are different
3. Members of a gene pair that are the same.
4. Physical appearance
Homozygous is _____________.
1. Members of a gene pair that are the same
2. Members of a gene pair that are different
3. Physical appearance
4. The letters used to indicate the presence of a gene
This individual carries the recessive trait but it is not apparent.
1. Homozygous dominant
2. Homozygous recessive
3. Heterozygous
4. Phenotype