Your SlideShare is downloading. ×
Human Inheritance
Human Inheritance
Human Inheritance
Human Inheritance
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Human Inheritance

1,527

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
1,527
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
14
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Name ____________________________ Date ____________________ Class ____________ Modern Genetics ■ Guided Reading and Study Human Inheritance This section explains some patterns of inheritance in humans. It also describes the functions of the sex chromosomes and the relationship between genes and the environment. Use Target Reading Skills As you read, write the main idea—the biggest or most important idea—in the graphic organizer below. Then write three supporting details that further explain the main idea. Main Idea Human traits are controlled by single genes with two alleles, single genes with . . . Detail Detail Detail a. b. c. Patterns of Human Inheritance 1. The probability that two heterozygous parents for widow’s peak will have a child with a straight hairline is ________________________ percent. Modern Genetics © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
  • 2. Name ____________________________ Date ____________________ Class ____________ Modern Genetics ■ Guided Reading and Study Human Inheritance (continued) 2. A gene with three or more alleles for a single trait has ________________________. 3. Is the following sentence true or false? Even though a gene has multiple alleles, a person can carry only two of those alleles. ________________________ 4. Complete the table by writing all possible combinations of alleles for each blood type. Blood Types Blood Type Combination of Alleles A B AB O 5. Why do some human traits, such as height and skin color, show a large number of phenotypes? ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 6. Is the following sentence true or false? Skin color is controlled by more than one gene. ________________________ © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
  • 3. Name ____________________________ Date ____________________ Class ____________ Modern Genetics ■ Guided Reading and Study The Sex Chromosomes 7. Is the following sentence true or false? Genes on chromosomes determine whether a baby is a boy or a girl. ________________________ 8. Females have two ________________________ chromosomes. Males have one ________________________ chromosome and one ________________________ chromosome. 9. Circle the letter of each sentence that is true about the sex chromosomes. a. All eggs have one X chromosome. b. Half of a male’s sperm cells have an X chromosome. c. None of a male’s sperm cells have a Y chromosome. d. The egg determines the sex of the child. 10. Genes on the X and Y chromosomes are called ________________________. 11. Why are males more likely than females to have a sex-linked trait that is recessive? ________________________________________________________________________ ________________________________________________________________________ 12. Is the following question true or false? A carrier for colorblindness is colorblind. ________________________ 13. Why is a son who receives the allele for colorblindness from his mother always colorblind? ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ The Effect of Environment 14. The effects of genes are often altered by the ________________________. 15. List one environmental factor that can affect a person’s height. ________________________________________________________________________ Modern Genetics © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
  • 4. Name ____________________________ Date ____________________ Class ____________ Modern Genetics ■ Review and Reinforce Human Inheritance A: Dimples D d Understanding Main Ideas Fill in the Punnett squares for dimples, a trait controlled by a dominant allele (A), and colorblindness, d 1. 2. a trait controlled by a recessive sex-linked allele (B). Then answer the questions that follow. (The father’s alleles are written across the top of the Punnett square. The mother’s alleles are written on the left side.) 5. Does either the mother or the father in A have d 3. 4. dimples? __________________________________________ 6. What percentage of children are likely to have dimples? __________________________________________ B: Colorblindness 11. Is either the mother or father in B colorblind? Xc Y ______________________________________ 12. What percentage of female children are likely to be colorblind? XC 7. 8. ______________________________________ 13. What percentage of male children are likely to be colorblind? ______________________________________ Xc 9. 10. Building Vocabulary Fill in the blank to complete each statement. 14. Three or more forms of a gene that code for a single trait are called ________________________. 15. ________________________ have alleles that are passed from parent to child on a sex chromosome. 16. A(n) ________________________ is a person who has one recessive allele for a trait and one dominant allele for the same trait. 17. ________________________ carry genes that determine whether a person is male or female. © Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

×