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35.Predictthe phenotype(s) of the F 1 generation.

36.Two members of the F 1 generation are mated. Determine

the predicted phenotype ratio for the F 2 generation.

708 Unit 30 C NEL

24.Identifythe stage of meiosis indicated by the labels X and

Y on Figure 2.

25.Describethe events at each stage of meiosis shown on

the flowchart in Figure 2.

26.Identifywhich cells in Figure 2would have haploid

chromosomes?

27.Cell A in Figure 2contains 44 chromosomes. Inferthe

number of chromosomes that cell C contains.

32.Use the diagrams and labels in Figure 3to help explain

the process of crossing over.

33.Identifycorrectly the letter label in Figure 3that marks

the first haploid cells formed by meiosis. Explain your

answer.

34.Identifythe correct letter label that marks metaphase II.

What is happening during this phase?

Use the following information to answer questions 24 to 27.

Figure 2is a flowchart showing the stages of meiosis for

spermatogenesis.

A

B

X

Y

C

B

C

C

C

Figure 2

28.Sketchthe karotype.

29.Predicthow many chromosomes will be found in a muscle

cell of the fetus.

30.From the information provided, is it possible to predict the

sex of the embryo? Explainyour answer.

31.Gene therapy is a technique in which defective genes are

located and substituted by normally functioning genes. In

the future, gene banks may likely be a common source of

genes for treating genetic disorders.Listtwo potential

disadvantages to society of the use of gene banks.

Use the following information to answer questions 32 to 34.

Figure 3shows the formation of sex cells in a mammal.

X

W Y

Z

Figure 3

Use the following information to answer questions 28 to 30.

A normal human sperm cell fertilizes an egg cell containing

24 chromosomes. A lab technician examining a karotype of

fetal cells notices trisomy of chromosome pair 21.

Use the following information to answer questions 35 and 36.

In guinea pigs, black hair is dominant to white hair, and short

hair is dominant to long hair. A guinea pig that is homozygous

for both white hair and for short hair is mated with a guinea

pig that is homozygous for both black hair and for long hair.

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