Genetics: Probability and Alleles
Flashcard
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the expected genotype ratio of offspring from two heterozygous parents (Aa x Aa) for a dominant trait?
Back
1 AA : 2 Aa : 1 aa
2.
FLASHCARD QUESTION
Front
How many chromosomes are in each gamete (sperm or egg) compared to the parent cell after meiosis?
Back
The gametes have half the number of chromosomes as the parent cell.
3.
FLASHCARD QUESTION
Front
Which genotype represents a heterozygous organism?
Back
Aa
4.
FLASHCARD QUESTION
Front
What is the probability that an offspring from a parent with genotype Aa (heterozygous) and another with genotype aa (homozygous recessive) will have the dominant trait?
Back
50%.
5.
FLASHCARD QUESTION
Front
What could be an effect of a mutation in a gene?
Back
The offspring may have a new genetic trait not seen in the parents.
6.
FLASHCARD QUESTION
Front
What is a dominant allele?
Back
An allele that expresses its trait even in the presence of a recessive allele.
7.
FLASHCARD QUESTION
Front
What is a recessive allele?
Back
An allele that only expresses its trait when two copies are present.
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