That means all the traits have genetic components from both mother and father. Therefore, the genetic situation is known as diploid (two sets of chromosomes).
Most eukaryotic organisms have two sets of genes known as maternal genes and paternal genes. It is the core reason for showing parental characteristics in the progeny. The genes inherited from the parental chromosomes control all the characters or traits of animals, plants, and all other living beings. She could pass that on to her own child.The key difference between homozygous and heterozygous is that homozygous means both alleles are similar for a trait while heterozygous means the two alleles are different for a trait. YES! HOW?If the curly haired girl has a genotype that shows INCOMPLETE DOMINANCE, she still has an allele for straight hair. This is called incomplete dominance.ĬANDY QUESTION: Could it be possible for this little girl to have her own daughter some day with straight hair? KP #5: Sometimes the dominant gene does not completely overpower the recessive gene. What about wavy hair? What gene combination do you think creates wavy hair? (THINK PHYSICAL) Ex: Curly hair = phenotypeWhos tired of saying GENE COMBINATION?Genotype or Phenotype?LETS PRACTICE!Jj:Cc:Tt:GenotypeGenotypeGenotypeFreckles:PhenotypeStraight hair line:PhenotypeDimples:Phenotype (THINK GENE) EX: Aa = genotypeĪnother word for trait or the way an organism looks or behaves is PHENOTYPE. aaLETS PRACTICE!Will these gene combinations show a Dominant or a Recessive Trait?bbTTrrFfGgLLRECESSIVERECESSIVEDOMINANTDOMINANTDOMINANTDOMINANTKP# 4: Another word for gene combinations is GENOTYPE. KP #3: A recessive trait will show ONLY if you have TWO recessive genes. Which guy do you think represents the dominant gene and which guy represents the recessive gene?DOMINANT! DOMINANT BEATS RECESSIVE WHATS THE RULE?KP #2: A dominant trait will show if you have ONE or TWO dominant genes. recessive means weakLETS PRACTICE!Is it a Dominant or a Recessive Gene?bTrfgLRECESSIVERECESSIVERECESSIVERECESSIVEDOMINANTDOMINANTOur two genes combine to make a trait:ĪA = two dominant genes = shows dominant traitaa = two recessive genes = shows recessive traitAa = one dominant and one recessive geneWhat do you think will show? Dominant means strongThis guy represents a recessive gene. KP#1: There are two types of genes: dominant (CAPITAL LETTER) and recessive (lowercase letter). How do we inherit either form of one of these traits? no cleft chinHairline: Two forms?Handedness: Two forms?Earlobes: Two forms?`Curliness of hair: Two forms?Freckles: Two forms? What are some examples of traits controlled by only ONE gene (from your HW!)Widows peak vs. These are the traits that you either have one form or the other.
So lets focus on some traits that are only controlled by ONE gene.
Thats why we have a variety of skin tones in the world! TRAITSGENE PAIRS OR ALLELESGENESSkin tone is an example of a trait that is controlled by multiple genes.
YOU WILL LEARN TODAY!Things we already know:Ĭhromosomes are made up of _Ī pair of genes that interact to code for a trait are called _ We tend to see these traits more often in society.Why is that?