Multiple Choice
Is cystic fibrosis caused by a dominant or a recessive allele?
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12. Meiosis
Genes & Alleles
Multiple Choice
In genetics, what does it mean for an organism to be homozygous recessive?
A
It has two identical recessive alleles for a particular gene.
B
It has no alleles for a particular gene.
C
It has two identical dominant alleles for a particular gene.
D
It has one dominant and one recessive allele for a particular gene.
Verified step by step guidance1
Understand the concept of alleles: Alleles are different forms of a gene that can exist at a specific locus on a chromosome. Each organism inherits two alleles for each gene, one from each parent.
Define homozygous: An organism is homozygous for a gene if it has two identical alleles for that gene. This can be either two dominant alleles or two recessive alleles.
Clarify recessive alleles: A recessive allele is an allele that is masked by the presence of a dominant allele. It only expresses its trait when paired with another recessive allele.
Explain homozygous recessive: An organism is homozygous recessive when it has two identical recessive alleles for a particular gene. This means the recessive trait will be expressed.
Review the options: Compare the definition of homozygous recessive with the given options to identify the correct answer, which is the organism having two identical recessive alleles for a particular gene.
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