Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 11.6, Problem 1CYL
  • describe how the patterns of inheritance differ between traits controlled by genes on a single chromosome and traits controlled by genes on different chromosomes?
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How can genetic heterogeneity affect inheritance patterns?
Sex-linked inheritance involves the genes on the sex chromosomes. Because inheritance patterns differ between females and males, crosses involving sex-linked inheritance use X’s and Y’s and the results of the crosses are given in percentage of female and male offspring with the affected traits, not in ratios. In humans, the sex chromosomes are X and Y. Females have two X chromosomes (XX) and males have one X and one Y (XY). In males, whatever alleles are on the X chromosome are expressed, whether they are dominant or recessive. In females, if the trait is recessive she is called a carrier and does not express the trait (in other words the dominant, normal trait is expressed). In order for her to express the recessive trait, she must be homozygous recessive (X+X+). If the trait is dominant, she will express the trait. Therefore, a female denoted as X+X-is either a carrier (the most common scenario) or expresses the allele if thetrait is dominant. Colorblindness is an X-linked recessive…
What is chromosomal theory of inheritance? List the ways in which genes and chromosomes behave similarly during meiosis and fertilization. How is sex determined in humans? Which sex determines the sex of the offspring? What are the two types of mutations? What are the four types of changes in chromosomal structure? Why would you expect a monosomy to be more lethal than a trisomy?

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How to solve genetics probability problems; Author: Shomu's Biology;https://www.youtube.com/watch?v=R0yjfb1ooUs;License: Standard YouTube License, CC-BY
Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY