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Name ______________________________ Class___________________Date__________________ Skills Worksheet Directed Reading B Section: Meiosis Circle the letter of the best answer for each question. 1. What are the two kinds of reproduction? a. chromosomes and offspring b. heredity and genes c. asexual and sexual d. mothers and fathers ASEXUAL REPRODUCTION 2. What is the name for the way cells divide in asexual reproduction? a. twins b. mitosis c. meiosis d. homologous 3. How many parent cells are needed in asexual reproduction? a. one b. two c. 100 d. none SEXUAL REPRODUCTION 4. How are offspring produced that are NOT like either parent? a. by asexual reproduction b. by something going wrong c. by sexual reproduction d. by mitosis Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 18 Heredity Name ______________________________ Class___________________Date__________________ Directed Reading B continued Circle the letter of the best answer for each question. 5. What do you call chromosomes that carry the same sets of genes? a. twin chromosomes b. homologous chromosomes c. ordinary chromosomes d. asexual chromosomes 6. How many chromosomes do human sex cells have? a. 100 b. 23 c. one d. none Meiosis 7. What copying process makes cells with half the usual number of chromosomes? a. sex cells b. meiosis c. a nucleus d. mitosis 8. What is made during meiosis? a. common human cells b. sex cells c. genes d. chromosomes Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 19 Heredity Name ______________________________ Class___________________Date__________________ Directed Reading B continued Genes and Chromosomes Circle the letter of the best answer for each question. 9. Where did Walter Sutton suggest that genes are found? a. on offspring b. in sex cells c. in typical cells d. on chromosomes THE STEPS OF MEIOSIS Read the description. Then, draw a line from the dot next to each description to the matching word. • • • • • • • • 10. exact copy of a chromosome 11. forms around each new cell 12. when the nucleus divides once 13. divides twice during meiosis 14. the first step in meiosis 15. how chromosomes get ready for cell to split 16. the last step in meiosis 17. the second step in meiosis a. nucleus b. mitosis c. chromatoid d. cell membranes a. four cells formed from one cell b. chromosomes line up at the center of cell c. chromosomes make copy of selves d. chromosomes pair up Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 20 Heredity Name ______________________________ Class___________________Date__________________ Directed Reading B continued MEIOSIS AND MENDEL Sex Chromosomes Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. Y Chromosome X chromosomes hemophilia meiosis 18. The steps in ______________________explain Mendel’s results. 19. Females have two ______________________, and males have one X and one Y. 20. When males give a(n) ______________________the offspring will be male. 21. A sex-linked blood-clotting disorder found mostly in males is ______________________. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 21 Heredity Name ______________________________ Class___________________Date__________________ Directed Reading B continued Genetic Counseling Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. carriers selective breeding recessive pedigree 22. To trace a family trait through many years, you can use a diagram called a ______________________. 23. A genetic counselor can often predict ______________________of hereditary diseases. 24. People with cystic fibrosis have two ______________________alleles. 25. Large eggs and large flowers are both created through______________________. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 22 Heredity