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Genetics
Name: _________________________
Date: _____________
Class: _________________________
1.
Label them in the correct sequence from the largest to the
smallest.
a. Nucleus, DNA, Chromosomes
b. Chromosomes, Nucleus, DNA
c. Nucleus, Chromosomes, DNA
(
)
2.
How many sets of chromosomes does a human have?
a. 24
b. 23
c. 21
(
)
3.
Which combination will result in a male?
a. XX
b. YY
c. XY
(
)
4.
What 2 animals in the zoo are genetically similar?
a. Zebra and Pony
b. Tiger and Manatee
c. Elephant and Giraffe
(
)
5. Read the clue and circle the correct answer.
(i) ‘a’ represents the gene for Albinism. Alina is heterozygous
Clue 1: Albinism is a recessive condition.
Clue 2: A – Normal
a – Albino
Is Alina an albino?
Singapore Zoo – Erichment Programme
Genetics
Yes / No
1
Copyright © Singapore Zoo. Permission to reproduce for non-profit purposes and teachers’ use during Zoo visits
(ii) B represents the gene for an extra finger. Bobby is homozygous
recessive.
Clue 1: Having an extra finger is a dominant trait
Clue 2: B – Extra finger b – Normal
Does Bobby have an extra finger?
Yes / No
(iii) D represents having smooth seed. A plant is homozygous
dominant.
Clue 1: Having smooth seed is a dominant trait.
Clue 2: D – Smooth seed d – Wrinkled seed
Does the plant produce smooth seeds?
Yes / No
Fill in the blanks.
Helping words
homozygous
heterozygous
phenotype
alleles
DNA
gene
dominant
chimpanzee
mutation
1) _______________ stands for deoxyribonucleic acid.
2) When there is a change in DNA, we say ______________ has
taken place.
3) Sickle-cell anemia is a ____________ recessive trait.
4) The observable characteristic of an organism is called
________________.
Singapore Zoo – Erichment Programme
Genetics
2
Copyright © Singapore Zoo. Permission to reproduce for non-profit purposes and teachers’ use during Zoo visits