BIOLOGY TEST#1
CHAPTER 1
GRADE 11 A/K
DATE:__________
_NAME:__________________________
Complete the punnett square and answer the questions that follow
X
Y
(4)
1. What Does sex-linked mean?
(1)
Answer:
2. If a gene is located on the Y chromosome, could the trait ever be expressed in a female?
Why?
(2)
Answer:
3. Out of 4 children, how many are expected to be female?
(1)
Answer:
4. Which sex chromosome do both males and females have?
Answer:
Use the pedigree to answer questions 5 and 6
(1)
5. Which person could develop symptoms of the disease that is tracked in the pedigree?
A. II
B. II1
C. II2
D. III2
6. According to the pedigree who is a carrier and cannot have children with the disease?
A. II
B. II1
C. II3
D. III1
(1)
(1)
SHORT ANSWER QUESTIONS
7. In pea plants, yellow seed colour is the dominant trait, and green seed colour is the recessive
trait. Use a punnet square to show the results of a cross between a heterozygous yellow
seed and a green seeded plant.
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8. Based on your punnet square from question 7 what percentage of the offspring would have
a homozygous genotype? Explain your answer.
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9. What is the name given to the failure of chromosomes to separate during Metaphase 1 or
2?
(1)
Answer:
10. What is the name of the disorder caused by an extra chromosome in chromosomes 21 in the
karyotype?
(1)
Answer:
11. If haemophilia is a sex-linked recessive gene, what is the chance that a father with hemophilia
and a mother who is a carrier for hemophilia will have a boy with hemophilia? Explain
Answer:
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BONUS QUESTION
12. Name 4 characteristics are associated with Down syndrome
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