Do Now 1. Which deals with the transmission of inherited traits from one generation to another? A. anatomy B. genetics C. ecology D. forensics   2. The inheritance of short wings in Drosophila fruit flies is an x-linked, recessive trait. Which would most likely result if a short-winged female mates with a long-winged male? A. All offspring will be short-winged. B. All females will be long-winged, and all males will be short-winged. C. All females will be short-winged, and all males will be long-winged. D. Half of the males and females will be short-winged, and half will be long-winged. 3. A parent with Type A blood and a parent with Type O blood have a child. Which of the following is a possible genotype of their offspring? A. IAIA B. IAIB C. Ibi D. ii 4. Why do identical twins become less alike as they grow older? A. Because the environment plays a role in influencing individuals B. Because the genetic makeup of the individuals changes C. Because the individuals’ cells undergo mitosis D. Because the number of recessive alleles exceeds the number of dominant alleles

Karyotypes First 22 pairs are called AUTOSOMES The 23rd pair is called the SEX CHROMOSOMES

A picture of an individual’s chromosomes Used to diagnose chromosomal abnormalities

Normal Male Karyotype

Normal Female Karyotype

Down’s Syndrome Karyotype Trisomy-21 3 chromosome 21’s

Turner’s Syndrome Karyotype XO Female with only 1 X chromosome

Kleinfelter’s Syndrome Karyotpe XXY Male with 2 X and 1 Y chromosomes

Cri Du Chat Karyotype Missing a piece of chromosome 5

Explain what a karyotype is and its uses. How can chromosomes cause genetic disorders?

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