Intro to Genetics and Sex Determination PDF

Welcome Back! Today we are beginning our next unit, Heredity! Check out the agenda for upcoming assessments and due dates. We will have a major grade project and an end of the unit exam over this unit! In the space provided, Describe how the sex of human offspring is determined. (You should be ment...

Welcome Back! Today we are beginning our next unit, Heredity! Check out the agenda for upcoming assessments and due dates. We will have a major grade project and an end of the unit exam over this unit! In the space provided, Describe how the sex of human offspring is determined. (You should be mentioning specific chromosomes) Sex Determination is different across all species. Thinking Question: Groups of species have the same form of sex determination in their offspring. What does this suggest about the evolutionary lineage?  Environmental Sex Determination. Read the passage on your desk and answer the following questions. 1. Describe what Environmental Sex Determination means? 2. For Temperature Dependent sex determination, describe the timing in which temperature determines the sex outcome. 3. Look at Figure 17.20 (there is a larger one at the end of the article) Describe the relationship between the sex ratio and environmental temperature of the alligator snapping turtle. 4. Propose an advantage to the sex determining system of the slipper snail? Another example of sex determination: The Komodo Dragon The Komodo dragon, Varanus komodoensis, is the world’s largest lizard species. –Males are up to 3m in length, 90 kg in weight. –Females are up to 2m and 70 kg.  How do Komodo Dragons Reproduce? Prior to 2006, it was thought that Komodo dragons could only reproduce sexually. However, in 2006, an interesting thing happened at two different British zoos that housed Komodo dragons… They can mate with males successfully after Parthenogenesis 2 female Komodo dragons (at different UK zoos) laid viable eggs without fertilization (i.e., no male sperm). –Flora: 11/25 (25 eggs laid, 11 were viable) –Sungai: 4/22 (22 eggs laid, 4 were viable)  Parthenogenesis and the WZ sex determination 1. Read this article. 2. Describe the WZ sex chromosomes and how they determine the sex of the offspring. What happens to WW individuals?  Today and Next Class 1 edpuzzle video for homework! Next class we will cover Meiosis!