Question

For question Nos.1-2 refer to the situation below.

Hemophilia is a disease caused by a gene found on the chromosome. It is referred to as a sex-linked. The recessive allele causes the disease. If a man with hemophilia marries a woman that is homozygous dominant with the trait, determine the probability that their children will have the disease. Use the Punnett

square to answer the questions.

Key :

XHXH-normal female

XHX -normal female, carrier of the gene

XX-hemophiliac female

1. What will be the genotype of the male?

A. X#XH

B. XX

XHY-normal male XFY- hemophiliac male

C.XHY

2. What are the chances that their children will have the disease?

B. 25%

B. 50%

C. 75%

3. Sex- influenced traits are autosomal. The controlling genes are located on

somatic chromosomes. One example of sex influenced is baldness

A. Sex Limited Traits

B. Sex Influenced Traits

D. XY

D. 100%

the

C. Sex Linked Traits

D. Sex Determination

4. What will be the sex of a child produced when an egg is fertilized by a sperm that

has a Y chromosome?

A. Female

B. undetermined

C. Male

D. none of the above

5. Males and females have 44 body chromosomes and 2 sex chromosomes. Which sex chromosome is present in both male and female?

A. X chromosome

B. both X and Y chromosome

C. Y chromosome

D. none of the above

6. If a child has XY pair of chromosomes, what is the sex of a child?

A. Male

B. Female

C. Hermaphrodite

D. Unidentified

7. How many pairs of sex chromosomes do we have?

A 46
B. 23
C.22
D. 1 8.

8.What will be the sex of a child produced when an egg is fertilized by a sperm that has a X

chromosome?

A Female

B. Male
C. Undetermined D. none of

9. What type of sperm must fertilize an egg to result in a male child? A X bearing sperm C. Y bearing sperm

D. none of the above 10. How many pairs of chromosomes are there in human? C. 24

B. undetermined

A,22 B. 23 11. The following are components of DNA EXCEPT,

D. 46

B. deoxyribose C. phosphates D. nitrogenous base 12. Why is there always the same number of adenine and thymine in a DNA molecule?

A sucrose

A. Because they appear in the molecule most of the time.

B. Because they always come in pairs.

C. Because they have the same number of carbon atoms.

D. Because they are equal to cytosine and guanine 13. Which of the following complementary base pairs are correct?

AAT 8, T-C 14. Which of these is NOT a nucleotide?

C. A-G

D. G-U

A. Deoxyribose sugar B. base C. phosphate D. Protein 15. One chain of a DNA molecule has a nucleotide sequence C. C, G, C. T. What is the

sequence of the nucleotides on its partner chain? A. GGCGA B. GCAGG C. ACG GG D.CGAGG

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Answer 1

Answer:

1 xfy

2 75/

3 sex linked traits

4 undetermined

5 x chromosome

6 female

7 46

8 undetermined

9 x bearing sperm

10 46

11 deoxy ribose

12 bcz they always come in pairs

13 confused

14 base

15 confused