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A couple has two children, both of whom are boys. What is the chance that the couple's next child will be a boy?
trisomy
alleles
homozygous recessive
nondisjunction
carrier
B and o only
50%
a color-blind father to pass the gene on to his son
The gene for red-green color blindness is located on the X chromosome. Therefore, which of the following is normally not possible?
trisomy
alleles
homozygous recessive
nondisjunction
carrier
B and o only
50%
a color-blind father to pass the gene on to his son
When a zygote contains three copies of a particular chromosome as a result of non-disjunction, which condition occurs
trisomy
alleles
homozygous recessive
nondisjunction
carrier
B and o only
50%
a color-blind father to pass the gene on to his son
Genes on homologous chromosomes may have alternate forms that control variations of a trait. What are these alternate forms called?
trisomy
alleles
homozygous recessive
nondisjunction
carrier
B and o only
50%
a color-blind father to pass the gene on to his son
A white mouse has parents that are both white. The white mouse produces only brown offspring when it mates with a brown mouse. What genotype is the white mouse?
trisomy
alleles
homozygous recessive
nondisjunction
carrier
B and o only
50%
a color-blind father to pass the gene on to his son
The failure of chromosomes to separate properly during meiosis is called
trisomy
alleles
homozygous recessive
nondisjunction
carrier
B and o only
50%
a color-blind father to pass the gene on to his son
An organism that has a gene for a trait but does not express it.
trisomy
alleles
homozygous recessive
nondisjunction
carrier
B and o only
50%
a color-blind father to pass the gene on to his son
A man with type O blood is married to a woman with type B blood. Which blood type(s) can their children have?
trisomy
alleles
homozygous recessive
nondisjunction
carrier
B and o only
50%
a color-blind father to pass the gene on to his son
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