Genetics Test 2024
Flashcard
•
Science
•
9th Grade
•
Practice Problem
•
Hard
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16 questions
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1.
FLASHCARD QUESTION
Front
What is the definition of a dominant allele?
Back
A dominant allele is a variant of a gene that expresses its trait even when only one copy is present in the genotype.
2.
FLASHCARD QUESTION
Front
What is the definition of a recessive allele?
Back
A recessive allele is a variant of a gene that only expresses its trait when two copies are present in the genotype.
3.
FLASHCARD QUESTION
Front
What is a heterozygous genotype?
Back
A heterozygous genotype consists of two different alleles for a particular gene, such as 'Bb'.
4.
FLASHCARD QUESTION
Front
What is a homozygous genotype?
Back
A homozygous genotype consists of two identical alleles for a particular gene, such as 'BB' or 'bb'.
5.
FLASHCARD QUESTION
Front
What is codominance in genetics?
Back
Codominance occurs when both alleles in a heterozygous genotype are fully expressed, resulting in a phenotype that shows both traits.
6.
FLASHCARD QUESTION
Front
What is the phenotypic ratio expected from a dihybrid cross of two heterozygous parents (BbSs)?
Back
The expected phenotypic ratio is 9:3:3:1.
7.
FLASHCARD QUESTION
Front
What is a Punnett square?
Back
A Punnett square is a diagram used to predict the genetic outcomes of a cross between two organisms.
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