1 / 10

3.3 Patterns of Inheritance

3.3 Patterns of Inheritance. Pgs. 50-54. 3.3 Patterns of Inheritance. Traits: desirable characteristics in organisms. We will uses animal fur color to focus on patterns of inheritance in this section .

deiter
Download Presentation

3.3 Patterns of Inheritance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 3.3 Patterns of Inheritance Pgs. 50-54

  2. 3.3 Patterns of Inheritance • Traits:desirable characteristics in organisms. We will uses animal fur color to focus on patterns of inheritance in this section. • Purebred:organisms whose ancestors have only produced one trait(white fur offspring) for several generations(either BB or bb, uppercase uppercase or lowercase lowercase) • Hybrid:an individual produced by crossing two purebred parents that differ in a trait (such as fur color) (always Bb, uppercase and lowercase)

  3. Patterns of Inheritance F E M A L E (bb) MALE (BB)

  4. Dominant Traits – the one that you see • If we cross a purebred white female (bb)with a purebred black male (BB), we notice the result is that all offspring have the same black coat (Bb). • A trait expressed preferentially over another trait. F E M A L E M A L E • Black fur is dominant because all offspring have black coats.

  5. Recessive Traits – “a carrier” F E M A L E • The opposite of dominant. A trait that is preferentially masked. • Has the white coat allele in the hybrid offspring disappeared? • No, to find out, we need to cross the hybrid female offspring with the hybrid male offspring. • The result is that¾of theoffspring are black, and¼is white. M A L E • The white fur kitten is and example of a recessive trait.

  6. How to know what color, or what trait will show… • If it is a purebred, then it will have the trait of the purebred. • BB – black cat. • bb – white cat • If it is a hybrid, it will always show the dominant trait. • Bb - black • Question: If we are talking about eye color, and I tell you brown eyes(E) are dominant over blue (e) what eye color will the following people have? • EE - Ee - ee-

  7. Homozygous vs. heterozygous • If the organism has two of the same alleles, (BB or bb) it is considered homozygous! • If the organism has different alleles, (Bb) it is considered heterozygous!

  8. Genotype vs. phenotype • Genotype is the genetic information. (BB, Bb, bb). • Genotype = genes! • Phenotype is what it will look like. (black, white) • Phenotype = looks!

  9. Incomplete Dominance • Sometimes the dominant-recessive pattern does not always work. • When a purebred black cat and a purebred white cat are crossed its offspring can be grey. • Neither of the parents’ alleles are dominant or recessive.

  10. Punnett square • An easy method to figure out what the off spring will look like!

More Related