Genetics
Flashcard
•
Biology
•
9th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an allele?
Back
An allele is a variant form of a gene that can produce different traits. For example, a gene for flower color may have a purple allele and a white allele.
2.
FLASHCARD QUESTION
Front
How many alleles does an offspring receive from each parent?
Back
An offspring receives one allele from each parent for a specific trait.
3.
FLASHCARD QUESTION
Front
What is the difference between genotype and phenotype?
Back
Genotype refers to the genetic makeup of an organism (the alleles it carries), while phenotype refers to the physical expression of those genes (how the organism appears).
4.
FLASHCARD QUESTION
Front
What is a dominant allele?
Back
A dominant allele is an allele that expresses its trait even when only one copy is present. For example, in pea plants, the allele for tall plants is dominant.
5.
FLASHCARD QUESTION
Front
What is a recessive allele?
Back
A recessive allele is an allele whose trait only shows up when two copies are present (i.e., when no dominant allele is present).
6.
FLASHCARD QUESTION
Front
What is a Punnett Square used for?
Back
A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.
7.
FLASHCARD QUESTION
Front
What is the phenotypic ratio in a cross between two heterozygous plants for a dominant trait?
Back
The phenotypic ratio is 3:1, meaning three offspring will show the dominant trait for every one that shows the recessive trait.
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