Mendelian Genetics and Heredity - Applications
Q. In a dihybrid cross, what is the expected phenotypic ratio of the offspring?
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A.
1:1
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B.
3:1
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C.
9:3:3:1
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D.
1:2:1
Solution
The expected phenotypic ratio of a dihybrid cross is 9:3:3:1, representing the combinations of two traits.
Correct Answer: C — 9:3:3:1
Q. What is the basic unit of heredity in living organisms?
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A.
Chromosome
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B.
Gene
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C.
DNA
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D.
RNA
Solution
A gene is the basic unit of heredity, responsible for the transmission of traits from parents to offspring.
Correct Answer: B — Gene
Q. What is the expected genotypic ratio from a monohybrid cross?
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A.
1:1
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B.
3:1
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C.
1:2:1
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D.
9:3:3:1
Solution
The expected genotypic ratio from a monohybrid cross is 1:2:1, representing the combinations of alleles.
Correct Answer: C — 1:2:1
Q. What is the term for an observable characteristic of an organism?
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A.
Genotype
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B.
Phenotype
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C.
Allele
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D.
Locus
Solution
Phenotype refers to the observable characteristics or traits of an organism.
Correct Answer: B — Phenotype
Q. Which of the following is a characteristic of recessive alleles?
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A.
Always expressed in the phenotype
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B.
Only expressed in homozygous condition
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C.
Expressed in heterozygous condition
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D.
Dominates over all other alleles
Solution
Recessive alleles are only expressed in the phenotype when in a homozygous condition (two copies of the recessive allele).
Correct Answer: B — Only expressed in homozygous condition
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