- Sex linked traits practice problems answers
- Solving pedigree genetics problems
- Punnett squares and sex-linked traits
- Sex linked trait practice problem
- Example punnet square for sex-linked recessive trait | high
- Target b1.2: sex-linked traits practice problems
- Punnett square practice problems (x-linked recessive
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- Sex linked traits: baldness and hemophilia
Solving pedigree genetics problems
The 23rd chromosome pair, also known as the identity chromosomes, determines biological sex in humans. Males have a “X” and a “Y” chromosome, while females have two “X” chromosomes. Female offspring get one X from their mother and one from their father. Male offspring receive one X and one Y from their mother and father, respectively. The X chromosome contains a variety of genes, making inheritance predictions intriguing.
In order for a recessive mutation on the X chromosome to be displayed, females must acquire two recessive alleles. Since there is no identical allele on the Y chromosome, males only need one copy of the allele.
Quick forward to the 10:54 minute mark in the following Bozeman Science Video for a different perspective on sex linkage and its discovery by Thomas Hunt Morgan. You are welcome to continue watching the video, but the final section does an excellent job of describing sex linkage in flies and humans.
2. Red eyes predominate over white eyes in fruit flies. The color of one’s eyes is a sex-related characteristic. A male with red eyes mates with a female with white eyes. Is there a possibility that a male offspring would have white eyes?
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Sex chromosomes determine sex in humans, most other animals, and some insects (notably, the well-studied fruit fly). These chromosomes, also known as the X and Y chromosomes, determine sex in the following way:
The X chromosome is far larger than the Y chromosome. As a consequence, the genes on the X chromosome have no corresponding genes on the Y chromosome, as seen in the partial chromosome map on the right.
As a result, genes on the X chromosome are passed down differently than genes on autosomal (non-sex) chromosomes. Let’s take a look at a gene near the bottom of the X chromosome that causes hemophilia to see how.
Hemophilia is a blood condition that runs in families. Hemophiliacs are unable to clot their blood. Though minor cuts are normally unaffected, hemophiliacs have severe internal bleeding issues. How is this disease passed down?
A trait that is sex related is one in which a gene is found on the sex chromosome. The concept refers to characteristics that are determined by genes on the X chromosome in humans. Since the X chromosome is larger and contains far more genes than the Y chromosome, this is the case. Since they have a single copy of the X chromosome with the mutation, males are more likely to be affected in a sex-linked disease. The consequence of the mutation in females can be masked by the presence of a second healthy copy of the X chromosome.
Sex is intertwined… There are characteristics present on any one of the chromosomes that determines sex or the chromosomes that decide sex. In humans, the X or Y chromosomes are involved. Hemophilia, red-green color blindness, congenital night blindness, certain high blood pressure genes, Duchenne muscular dystrophy, and Fragile X syndrome are some of the more well-known sex-linked traits. So, you can assume that having these various mutations on the genes, on the X chromosome, is especially troublesome for individuals who are XY or males, since unlike females, there aren’t two X chromosomes that give you the potential of possessing a regular gene on the X chromosome. As a result, you’ll notice that males are more often affected by these sex-related disorders.
X Indicates a Location
6 minutes – Direct Instruction – “X” Inactivation Explained
Students will watch a video clip that will act as the lesson’s direct guidance.
During the 6-minute video, students will take notes, and the class will do a short whole-group analysis to explore the most important aspects of the idea of “x”inactivation.
During our class discussion, students will be encouraged to ask questions and seek clarification.
Creating The “X” Cats #1 – Each student work sample will depict a different color combination pattern to show the randomness of x-inactivation during the embryonic stage of development.
Creating the “X” Cats #2 – Since several students flipped multiple heads in a row and multiple tails in a row, this activity enabled students to experience the independent nature of each trial.
When students were asked what the chances were of flipping a heads next, they pondered and answered 50%.
Students realized that they had a 50/50 chance of getting heads no matter how many times they flipped the coin.