Other Patterns of Inheritance (High School Biology)
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Uploaded by AdaptableFrancium
Pallavi Rallapalli
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Summary
This document outlines various non-Mendelian inheritance patterns, such as incomplete dominance, codominance, and multiple alleles, crucial to understanding how traits are passed down. The presentation also includes a discussion on the interplay between genes and environmental factors in determining the expression of these traits, such as skin tanning and animal coloration.
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OTHER PATTERNS OF INHERITANCE Chapter 12 Section 3 Pallavi Rallapalli NON-MENDILIAN INHERITANCE Not all traits follow a Mendelian pattern of inheritance Some traits are influenced more by the mother or father Some traits are influenced by the environment INCOMPLETE...
OTHER PATTERNS OF INHERITANCE Chapter 12 Section 3 Pallavi Rallapalli NON-MENDILIAN INHERITANCE Not all traits follow a Mendelian pattern of inheritance Some traits are influenced more by the mother or father Some traits are influenced by the environment INCOMPLETE DOMINANCE Some alleles are neither dominant nor recessive Incomplete dominance- the heterozygote lies somewhere in the middle of the two homozygous phenotypes 4 o clock flowers CODOMINANCE A situation where both alleles are expressed equally and at equal intensities Black and white chickens Blood type- in people Camellia flowers HUMAN BLOOD TYPES Represented with IA , IB, i (A, B, O) A and B are codominant- if both alleles are present, both will be expressed O is recessive- both alleles must be i Blood Type A- IAIA or IA i Blood Type B- IBIB or IB i Blood Type AB- IAIB Blood Type O- ii RH FACTOR Rh- factor- Determined by the RHD and RHCE gene The RHD gene is dominant, so a person will be Rh positive if they inherit at least one copy of the RHD gene. If a person inherits no copies of the RHD gene, they will be Rh negative. To determine blood type: Determine which alleles are present (A, B, O) Determine the Rh factor (positive or negative) BLOOD DONATION Universal Donor- O negative Universal Recipient- AB positive MULTIPLE ALLELES Many genes exist in several different forms, and are said to have multiple alleles Multiple alleles- genes with more than two different alleles POLYGENIC TRAITS Polygenic traits- traits that are produced by interactions between several genes Eye color Hair color Skin color GENE Typically, the closer two LINKAGE genes are on a chromosome, the more likely they are to be inherited together GENES AND THE ENVIRONMENT The environment affects how genes are presented Skin tans if exposed to sunlight Animals that hunt at night tend to be darker in color
