Name: ______________________________________________________ Period:_____ Chapter Review: 10 Mendel & Meiosis College Biology 1. An organism that is true breeding for a trait is said to be (a) homozygous (b) heterozygous (c) a monohybrid (d) a dihybrid 2. At the end of meiosis, how many haploid cells have been formed from the original cell? (a) one (b) two (c) three (d) four 3. When Mendel transferred pollen from one pea plant to another, he was ___ the plants. (a) self pollinating (b) cross pollinating (c) self fertilizing (d) cross fertilizing 4. A short pea plant is (a) homozygous recessive (b) homozygous dominant (c) heterozygous (d) a dihybrid 5. Which describes a dominant trait in garden peas? (a) …show more content…
The likelihood of close relatives sharing the same recessive alleles is greater than in the general population, raising the risks that a child would be homozygous recessive for a trait. 21. Assume that a couple has four children who are all boys. What are the chances their next child will also be a boy? Explain your answer. 50% because previous births do not affect any children that will follow. 22. How does separation of
In a family with two children, what are the chances that both children are girls?
Gregor Johann Mendel, the father of genetics, was born in 1822. He was a priest and scientist who became famous for his work and studies on the inheritance patterns using pea plants. Gregor Mendel used pea plants known as Pisumsativum in his research where he developed two fundamental laws of genetics known today as the “Law of segregation”, and the “Law of independent assortment” (Hartl, 1992). The “Law of segregation” states that when an individual produces a gamete, the copies of a given gene separate in which each gamete receives only one copy of that gene. The phenotypic ratio in the F2 generation according to the “Law of
What is urbanization? Which countries are the most urbanized? The least urbanized? What is the urbanization trend today in largely rural nations? Urbanization is a process in which people increasingly move from rural areas to densely populated cities.
In the article, “Why Inbreeding Isn’t as Bad as You Think”, Wilkins debunks the myths behind inbreeding and attributes them to cultural taboos. Wilkins alludes that cousins who are the first in their family lineage to inbreed have the exact same changes of having healthy offspring as unrelated couples. He then mentions that marrying a second cousin would greatly increase one 's chance of having healthy offspring. In the article, cousins of inbreeding that are detrimental to the offspring 's health and mentions that this may occur when inbreeding has happened for long periods of time. It is because both parents may be carriers of the recessive gene, although 96% of children produced from such mating are health. Wilkins concludes that if anyone traces back thousands of years, they will find they shared the same ancestors as their partners so everyone in a way, has been exposed to inbreeding. In the informative article, Wilkins writes for the average reader and shows his bias about cultural taboos when he mentions that there can be disorders but yet explains that they are not.
Genetic traits passed down for many generations is an interesting concept because if a married couple both have the recessive gene, then the offspring will definitely have the recessive genes as well. For example, if both parents have blue eyes, then the children are guaranteed to have blue eyes just like the parents. This is something I found very interesting because there is a chance that the recessive gene will continue to be passed down to future family members causing blue eyes to run in the family. Something else that I found interesting was that the right-handclasp is seen as a recessive trait. I thought that it would be seen as a dominant trait because of the fact that most people are right handed. Although there are some things that
Whether we are born males or females is determined by the X and the Y chromosomes. A person who gets two X chromosomes forms as a female while a person who gets both an X and a Y forms as a male. So I have both an X and a Y chromosome while my three sisters all have two X chromosomes. Some human disorders are sex linked. Hemophilia and colorblindness are due to recessive alleles. A male who receives a recessive allele from his mother will have the disorder however for a female to have the disorder both the mother and father must pass on the recessive allele.
There are many issues today involving genetics and inheritances; therefore, I want to introduce this subject to students and allow them the opportunity to learn about it. Before students begin this genetics unit they should have a basic understanding of DNA, cellular reproduction, and the process of mitosis and meiosis. Additionally, this unit will contain activities that require students to employ critical and higher order thinking skills; I believe these skills can prepare students for the kinds of issues they may encounter in the world in the future.
Dominant and recessive inheritance are useful concepts when it comes to predicting the probability of an individual inheriting certain phenotypes, especially genetic disorders. But the terms can be confusing when it comes to understanding how a gene specifies a trait. This confusion comes about in part because people observed dominant and recessive inheritance patterns before anyone knew anything about DNA and genes, or how genes code for proteins that specify traits.
Meiosis 2 is similar to mitosis, however, at the end of meiosis II, four haploid cells called gametes have been formed, each with no duplicate chromosomes. The chromatids of each chromosome are not identical
However to cross-fertilize the pea plants Gregor Mendel used a slightly different method whereby he opened an immature pea plant. Mendel then took out the stamen before they could become mature and drop pollen upon the pistil. Thereafter using the pollen, which he had taken out, he then dusted and brushed the pollen on to the pistil of another pea plant transferring them with the aid of a small brush. The cross-fertilizing of the two plants was named as the parental generation (P) as they were the first to be pollinated and fertilised.