I'm a Biology teacher and I make these videos to help my A Level students understand the more difficult concepts. You won't find lots of text or powerpoint slides in my videos, I like to use my own drawings to help focus the viewer on what I'm explaining. Each video focuses on a particular concept, rather than a whole topic, so you don't get overwhelmed!
All of the explanations follow the CIE Biology A Level syllabus in terms of the detail and terminology I use, but they should be helpful no matter what exam board are studying.
Hello ma'am, Thank you for this great video and being so kind to the students by explaining everything so beautifully. QUERY- At 5.45, you said that water enters the root through diffusion. This has confused me as in the texts we follow, it says that water enters the root through osmosis. Request you to please clear this doubt. Thank you.
it is a shame this isn't what comes up first when looking for A Level B biology stuff because this channel is so underrated compared to other bio a level channels, especially for visual learners, the fact you draw everything out instead of using static images really really helps, thank you so much.
amazing video, thank you ! I have a question though, how can abscisic acid can open and close the stomata ? like its the same chemical but has 2 different effects. do we simply choose which one would occur based on the information given ? (Ex if hot and dry climate then say it closes etc)
Here's how Gregor Mendel's laws of independent assortment and segregation connect to meiosis: **Meiosis:** Meiosis is a type of cell division that shuffles and reduces the genetic material (chromosomes) of a diploid cell (2n) to create four haploid (n) gametes (sperm or egg cells). This process is crucial for sexual reproduction, ensuring genetic diversity in the offspring. **Mendel's Laws:** * **Law of Segregation:** This law states that during gamete formation, the alleles (different versions) of a gene for a single trait separate from each other. Each gamete receives only one allele for each gene. **Connection to Meiosis:** During meiosis I, homologous chromosomes (chromosomes that code for the same trait) pair up. However, these pairs then undergo **independent assortment** during meiosis I. This means that the homologous pairs separate **randomly** from each other, with one chromosome from each pair going to each daughter cell. This random separation is the key to segregation. * **Law of Independent Assortment:** This law states that the inheritance of traits coded for by different genes is independent of each other. The alleles for one trait separate from each other independently of the alleles for another trait. **Connection to Meiosis:** Since homologous chromosome pairs separate **independently** during meiosis I, the alleles for different genes located on **non-homologous chromosomes** are also **separated independently**. This allows for various combinations of alleles for different traits to end up in the gametes. **Example:** Imagine a pea plant with genes for flower color (purple or white) and pod shape (round or wrinkled). These genes are located on different chromosomes. * **Segregation:** During meiosis, the alleles for flower color (P or p) on the homologous chromosome pair separate, with one allele going to each daughter cell. The same happens for the alleles for pod shape (S or s) on another chromosome pair. * **Independent Assortment:** Since these genes are on different chromosomes, their separation is independent. This means a gamete could receive a P allele for flower color along with an S allele for pod shape, or a p allele with an s allele. All possible combinations (PS, Ps, pS, ps) can occur in the gametes due to independent assortment of chromosomes. **Combined Effect:** These laws working together in meiosis create a vast pool of genetic variation in the gametes. When fertilization occurs (sperm and egg fuse), the resulting zygote receives a unique combination of alleles from both parents, leading to genetic diversity in the offspring. **In summary, Mendel's laws of segregation and independent assortment are based on the random separation of chromosomes and alleles during meiosis. This shuffling of genetic material creates the foundation for genetic variation in sexually reproducing organisms.**
I had a question tht is, does the Na+ ions jump nodes to the nodes of ranvier? Bcz of that fact that impulses travel by jumping from node to node if I m correct hence is it that? I m really confused abt it for which my question might sound confusing as well, but I hope u understand what I mean
how do you get like 10 cm^3 of each successive solution when doing a serial dilution. like when diluting by a factor of 10 and have each successive beaker with a volume of 10cm^ as what stays in it
