Presentation on theme: "Sex-Linked Traits Chapter 4.1. Answers to Questions 1. What are sex-linked traits? - Human traits that are carried on the sex chromosomes. 2. What’s a."— Presentation transcript:
Answers to Questions 1. What are sex-linked traits? - Human traits that are carried on the sex chromosomes. 2. What’s a carrier? - A person who has one recessive allele for a trait and one dominant allele. 3. Males have one X chromosome. Males will be color- blind if they have one allele, and females need two recessive alleles to be colorblind.
Sex-determination Autosomes --- Non-sex chromosomes; 22 pairs or 44 individual chromosomes. 23 rd pair --- Sex chromosomes; determines gender. XX --- female XY --- male
Sex-influenced Traits Expressed differently in both sexes due to different hormones which are determined by different sets of genes. Examples --- male-pattern baldness, horn size in mountain sheep, and feather color in peacocks.
Sex-linked Traits Traits found on sex chromosomes. 2 traits that are X-linked inheritance in humans are certain forms of color-blindness & hemophilia. Hemophilia --- blood disorder where your blood doesn’t clot.