S3 Review

TOPIC 1: Human Reproductive System
The male and female reproductive organs

1. Below are some parts of the male and female reproductive system. Write them in the
table under the appropriate heading.
 Testes
 Vagina
 Uterus
 Penis
 Scrotum
 Ovary
 Oviduct
 Sperm duct
Male Reproductive Organs Female Reproductive Organs
The Menstrual Cycle

2. a) How long is the average menstrual cycle?
b) How does the wall of the uterus change during the course of the cycle?
c) State two different occasions when the menstrual cycle stops.
Fertilization
3. Where does fertilization take place? Tick (⩗) one box.
Sperm duct
Uterus
Oviduct
Scrotum
The Development of the baby
4. Where does implantation take place? Tick (⩗) one box.
Cervix
Uterus
Oviduct
Testes
5. From what does the placenta from? Tick (⩗) one box.
The uterus
The zygote
Sperm cells
The oviduct
6. a) Name three substances that pass through the placenta from the mother to the baby.
b) Name a substance that passes through the placenta from the baby to the mother.
c) What is the name of the structure that attaches the placenta to the developing
baby?
d) The placenta produces hormone. What do they do?
e) What is the correct term for the developing baby 1 week after fertilization when the
organ systems are starting to develop? Tick (⩗) one box.
Baby
Fetus
Embryo
Zygote
7. What is the correct term for the developing baby 8 weeks after fertilization when all the
main organ systems have formed? Tick (⩗) one box.
Baby
Fetus
Embryo
Zygote
8. How do the placenta and the amniotic fluid help the embryo and fetus develop?
TOPIC 2: Gene and Chromosome
Answer the following questions correctly.
1. In dogs, black fur (B) is dominant over yellow fur (b). A heterozygous black dog is
mated with a yellow dog. Make a Punnett square to show the cross and predict the
offspring (phenotypes and genotypes).
2. In dogs, a dominant gene (W) produces wire-haired texture. The recessive allele (w)
produces smooth hair. A homozygous wire-haired male is mated to a female with smooth
hair. Show the punnett square. What genotypes and phenotypes are expected in the F1
generation, and in what ratios?
3. Short hair (L) is dominant over long hair (l) in rabbits. Two heterozygous rabbits are
mated. Show the punnett square. What phenotypes are expected, and in what ratios of
the bunnies produced?
4. In pea plants, yellow seed color is dominant to green seed color. If a heterozygous pea
plant is crossed with a plant that is homozygous recessive for seed color, what is the
probability that the offspring will have green seeds?
5. Red eyes (R) in fruit flies are dominant over white eyes (r). Using Punnett squares, find
the possible eye colors of the F1 generation for each of the following crosses.
a. Rr x rr b. rr x RR c. Rr x Rr
6. Set up a Punnett square using the following information:
 Dominate allele for tall plants = D
 Recessive allele for dwarf plants = d
 Dominate allele for purple flowers = W
 Recessive allele for white flowers = w
Cross a homozygous dominate parent (DDWW) with a homozygous recessive parent

(ddww)
a. What is the probability of producing tall plants with purple flowers? Possible
genotype(s)?
b. What is the probability of producing dwarf plants with white flowers? Possible
genotype(s)?
c. What is the probability of producing tall plants with white flowers?
7. Set up a Punnett square using the following

information:
 Dominate allele for black fur in guinea pigs = B
 Recessive allele for white fur in guinea pigs =b
 Dominate allele for rough fur in guinea pigs =R
 Recessive allele for smooth fur in guinea pigs = r
Cross a heterozygous parent (BbRr) with a heterozygous parent (BbRr)
a. What is the probability of producing guinea pigs with black, rough fur? Possible
genotype(s)?
b. What is the probability of producing guinea pigs with black, smooth fur?
Possible genotype(s)?
c. What is the probability of producing guinea pigs with white, rough fur?
d. What is the probability of producing guinea pigs with white, smooth fur?
I
1 2
II 1 2 4 5
3 6 7 8
III
1 2 3 4 5
1. Which members of the family above are afflicted with Huntington’s Disease
2. There are no carriers for Huntington’s Disease- you either have it or you don’t. With this in
mind, is Huntington’s disease caused by a dominant or recessive trait?
3. How many children did individuals I-1 and I-2 have?
4. How many girls did II-1 and II-2 have? How many have Huntington’s Disease?
5. How is individual III-2 and II-4 related? I-2 and III-5?
6. The pedigree to the right shows the passing on

of Hitchhiker’s Thumb in a family. Is this trait
dominant or recessive?
7. How do you know?
8. How are individuals III-1 and III-2 related?
9. Name 2 individuals that
have hitchhiker’s thumb.
10. Name 2 individuals that were
carriers of hitchhiker’s thumb.
11. Is it possible for individual IV-2 to be a carrier? Why?
12. The pedigree to the right shows the passing on of
colorblindness. What sex can ONLY be carriers of
colorblindness?
13. With this in mind, what kind of non-mendelian
trait is colorblindness?
14. Why does individual IV-7 have colorblindness?
15. Why do all the daughters in generation II carry
the colorblind gene?
16. Name 2 IV generation colorblind males.

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TOPIC 1: Human Reproductive System

The male and female reproductive organs

The Menstrual Cycle

TOPIC 2: Gene and Chromosome

Answer the following questions correctly.

Cross a homozygous dominate parent (DDWW) with a homozygous recessive parent

7. Set up a Punnett square using the following

6. The pedigree to the right shows the passing on

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