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Grade 12 Challenge: Biology by the Numbers Worksheet with Answers
Grade 12 (US) · Year 13 (UK) · Class 12 (India) · Biology
Unit 5: Going FurtherReal-World ChallengeChallenge
Quantitative biology: carrier frequencies, multi-gene crosses, family genetics odds, population estimates and bacterial growth. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.
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Practice Sheetaethelsystems.comChallenge: Biology by the Numbers
Grade 12 · Biology
Name
Class
Date
Learning goal: Real-World Challenge
Directions: Read each question carefully and write your answer on the line.
Ecologists catch, tag and release 84 fish in a lake. Later they catch 144 fish and 12 are tagged. Estimate the lake's fish population.
Answer: 1008
- 1
Two parents are both carriers of a recessive condition. If they have 4 children, what is the probability that exactly 3 of them are affected? Give a fraction.
- 2
In a micrograph at ×400, a cell measures 36 mm. What is its actual size in µm, to 1 decimal place?
- 3
Two unaffected parents have a child with a recessive condition. Their second child is unaffected. What is the probability that this second child is a carrier? Give a fraction.
- 4
Two parents are both carriers of a recessive condition. If they have 4 children, what is the probability that exactly 2 of them are affected? Give a fraction.
- 5
A heart beats 70 times a minute, every minute, for 70 years (use 365.25 days a year). How many billion beats is that, to 1 decimal place?
- 6
In a micrograph at ×400, a cell measures 18 mm. What is its actual size in µm, to 1 decimal place?
- 7
Genes assort independently. Parents AABb × AaBb have a child. What is the probability the child's genotype is exactly Aabb? Give a fraction.
- 8
Genes assort independently. Parents AaBB × AaBb have a child. What is the probability the child's genotype is exactly aaBb? Give a fraction.
- 9
Model a cell as a cube of side 2 µm. What is its surface-area-to-volume ratio (per µm)? Give an exact answer.
- 10
One bacterium divides every 30 minutes. How many minutes until there are at least 1 million bacteria?
- 11
A heart beats 80 times a minute, every minute, for 70 years (use 365.25 days a year). How many billion beats is that, to 1 decimal place?
- 12
Ecologists catch, tag and release 57 fish in a lake. Later they catch 84 fish and 9 are tagged. Estimate the lake's fish population.
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Free printable worksheets with answer keys · aethelsystems.com/worksheets/biology/12/challenge_biology_world
Answer key — Challenge: Biology by the Numbers (Grade 12)
- 1.3/64
- 2.90.0
- 3.2/3
- 4.27/128
- 5.2.6
- 6.45.0
- 7.1/8
- 8.1/8
- 9.3
- 10.600
- 11.2.9
- 12.532
Answer key (click to show)
- 1.3/64
- 2.90.0
- 3.2/3
- 4.27/128
- 5.2.6
- 6.45.0
- 7.1/8
- 8.1/8
- 9.3
- 10.600
- 11.2.9
- 12.532
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