Unit 7 assessment
Flashcard
•
Science
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a homozygous dominant genotype?
Back
A homozygous dominant genotype has two identical dominant alleles, represented as 'YY'.
2.
FLASHCARD QUESTION
Front
What is a homozygous recessive genotype?
Back
A homozygous recessive genotype has two identical recessive alleles, represented as 'tt'.
3.
FLASHCARD QUESTION
Front
What is a genotype?
Back
A genotype is the genetic makeup of an organism, represented by the alleles it possesses.
4.
FLASHCARD QUESTION
Front
What is a phenotype?
Back
A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.
5.
FLASHCARD QUESTION
Front
What is the ratio of homozygous recessive offspring from a cross of two heterozygous parents (Tt x Tt)?
Back
The ratio is 1 in 4, or 25%.
6.
FLASHCARD QUESTION
Front
Which nitrogenous base is NOT part of DNA?
Back
Uracil is NOT part of DNA; it is found in RNA.
7.
FLASHCARD QUESTION
Front
What are alleles?
Back
Alleles are different forms of a gene that can exist at a specific locus on a chromosome.
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