Practice Question
An organism with an unknown genotype is crossed with another organism that shows the recessive trait (aa). The Punnett square below shows the results. Which of the following is the unknown genotype?
Answer Choices:
Correct Answer:
Aa
Rationale:
🔷 The organism with the unknown genotype is crossed with a homozygous recessive (aa).
🔷 The offspring are 50% Aa (heterozygous) and 50% aa (homozygous recessive).
🔷 This result occurs only when the unknown parent is heterozygous (Aa).
🔷 If the unknown genotype had been AA, all offspring would be Aa (dominant phenotype).
🔷 If it had been aa, all offspring would be aa. The 1:1 ratio confirms Aa.
Want to practice more questions like this?
This question is from ATI TEAS 7 Science~2024 Exam 1 which contains 50 questions.
More Questions from This Exam
Hikers who found a human body at high altitude in the Italian Alps thought the man had died recently, but tests indicated he was shot with an arrow more than 5,300 years ago. Which of the following would be the best reason for prolonged preservation of the body
Answer Choices:
A. The ultraviolet rays at such a high altitude caused all his molecules to be preserved.
B. The food that the person ate contained toxins that killed the bacteria that would have otherwise destroyed the body.
C. The body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found.
D. The arrow wound caused blood to flow out of the body which led the enzymes that would break down tissue to be cleared from the body.
Experiments cannot validate hypotheses, only falsify them. The statement above can be restated in which of the following ways.
Answer Choices:
A. Until disproved, an explanation for an observation is valid.
B. Certain concepts cannot be subjected to direct experimentation.
C. A hypothesis that has not been falsified remains provisional.
D. Proving a hypothesis exempts it from further testing
In which of the following regions of the body are the tibia and fibula?
Answer Choices:
A. Coxal
B. Antecubital
C. Tarsal
D. Crural
Which of the following functions does the myelin sheath perform for a nerve cell?
Answer Choices:
A. Insulation
B. Regeneration
C. Sensory perception
D. Nutrition
Which of the following occurs in an oxidation reaction?
Answer Choices:
A. Removal of oxygen
B. Addition of carbon
C. Addition of neutrons
D. Removal of electrons
Question Details
- Category: ATI TEAS
- Subcategory: Science Exam(s)
- Domain: Science~2024
- Answer Choices: 4