Open Question
Compare and contrast amniocentesis and chorionic villus sampling as to the time at which they can be performed and the techniques used to obtain information on the fetus’s genetic status.
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29. Heredity
Overview of Human Genetics
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When the two alleles controlling a trait are different, the individual is __________ for the trait.
A
homozygous
B
dominant
C
recessive
D
heterozygous
Verified step by step guidance1
Understand the concept of alleles: Alleles are different forms of a gene that are found at the same place on a chromosome. Each individual inherits two alleles for each gene, one from each parent.
Define homozygous: An individual is homozygous for a trait if they have two identical alleles for that trait, either both dominant or both recessive.
Define heterozygous: An individual is heterozygous for a trait if they have two different alleles for that trait, one dominant and one recessive.
Differentiate between dominant and recessive alleles: A dominant allele is one that expresses its trait even if only one copy is present, while a recessive allele only expresses its trait if two copies are present.
Apply the definitions: Since the problem states that the two alleles controlling the trait are different, the individual is heterozygous for the trait.
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