Betty flicked her own unattached earlobe to show the opposite. "This is an example of dominant vs. recessive genes. When you're conceived, you inherit one set of genes from your mother and one set from your father." Next slide showing the DNA zoomed out to a longer strand that makes an X. "This is why chromosomes are in pairs. Now, lets say...." Betty gets out the electronic pen, clearing the screen so she can write on it.
"The genes for attached earlobes, we'll call them A, are the dominant gene. Unattached are recessive so we'll call them lower case a. In order for you to have unattached earlobes, you will need to inherit both recessive genes from your parents." She writes down aa below the two, connecting with lines to the side. In the middle is Aa and on the other side AA. "If you have both dominant genes, then you have attached earlobes. If you have one dominant and the other recessive, the dominant takes over and you have attached earlobes."
Betty pauses to be sure the class is following so far. "In this case, the genes are called alleles."
![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
no subject
Date: 2013-05-26 03:04 pm (UTC)From:"The genes for attached earlobes, we'll call them A, are the dominant gene. Unattached are recessive so we'll call them lower case a. In order for you to have unattached earlobes, you will need to inherit both recessive genes from your parents." She writes down aa below the two, connecting with lines to the side. In the middle is Aa and on the other side AA. "If you have both dominant genes, then you have attached earlobes. If you have one dominant and the other recessive, the dominant takes over and you have attached earlobes."
Betty pauses to be sure the class is following so far. "In this case, the genes are called alleles."