Concept Check 14.1 C O N C E P T C H E C K 14.1 1. Pea plants heterozygous for flower position and stem length (AaTt) are allowed to selfpollinate‚ and 400 of the resulting seeds are planted. Draw a Punnett square for this cross. How many offspring would be predicted to have terminal flowers and be dwarf? (See Table 14.1.) 1. According to the law of independent assortment‚ 25 plants (1⁄16 of the offspring) are predicted to be aatt‚ or recessive for both characters. The actual result is likely
Premium DNA replication DNA Gene
Down Syndrome is a chromosomal condition related to chromosome 21. It affects 1 in 800 to 1 in 1000 born infants. People who have Down Syndrome have learning difficulties‚ mental retardation‚ a different facial appearance‚ and poor muscle tone (hypotonia) in infancy. Individuals with Down Syndrome also have an increased risk for having heart defects‚ digestive problems such as “gastroesophageal reflux or celiac disease”‚ and hearing loss. Some people who have Down Syndrome have “low activity of
Premium Down syndrome Chromosome Genetics
Introduction A chromosome is a minuscule threadlike part of the nucleus and a structured DNA in the form of genes carrying hereditary information (Bridges‚ 1938). Endomitosis is the process of mitosis of chromosomes without undergoing nuclear or cellular division to increase cell volume. This results in a single nucleus having many copies of a single chromosome (Painter & Reindorp‚ 1940). In this experiment‚ Drosophila melanogaster is reared in specific conditions and its salivary gland extracted
Premium DNA Chromosome Gene
few simple reasons; they are small and easily handled‚ they have a short life cycle and they are easy to keep large numbers such as the confined spaces of a laboratory or classroom. [1] Drosophila also have a small number of chromosomes: three autosomal pairs and X/Y chromosomes. This helps to simplify genetic mapping and study. The egg of a Drosophila is around half of a millimeter long and will take one day from fertilization for the embryo to develop and hatch into its larvae form. The larvae
Premium Allele Chromosome Mutation
meiosis increase genetic variation? Introduction Most cells in organisms that reproduce sexually are diploid. They have two sets of chromosomes and two complete sets of genes. Gametes are an exception. Gametes are the cells that combine during sexual reproduction. In animals‚ these cells are called sperm and eggs. Gametes are haploid cells with only one set of chromosomes. Meiosis is the process in which haploid cells form from diploid cells. In this lab‚ you will model the steps in meiosis. You will
Premium Chromosome Meiosis
affecting a gene to deleting or adding chromosomes. There are approximately 1‚100 genetic disorders. I’m going to talk about Chromosome 5p Deletion. Chromosome 5p deletion is a genetic disorder because it is missing a copy of genetic material. Chromosome 5p deletion is an abnormality that occurs when you’re missing a region of chromosome 5. A Chromosome is a long‚ continuous thread of DNA that consists of numerous genes and regulatory information. Chromosome 5p deletion is also known as Cri du Chat
Premium Genetics DNA Gene
Stored inside chromosomes and contain all instructions for life It is made up of Ribose (sugar)‚ phosphate‚ and when of 4 Nitrogenous bases (Adenine‚ Thymine‚ Guanine and Cytosine) A Nucleotide consists of a Phosphate molecule‚ a sugar molecule‚ and a Nitrogenous base pair The nitrogenous bases always pair up AT and CG Each human has 46 chromosomes 23 pairs in total 1 pair sex chromosomes (that define your sex‚ male XX‚ female XY) 22 pairs of autosomes (non-sex chromosomes) Each pair is
Premium Mitosis Meiosis Chromosome
4.1.1 State that eukaryote chromosomes are made of DNA and proteins.(1) State means to give a specific name‚ value or other brief answer without explanation or calculation. The chromosome is composed of two main molecules. a) DNA b) Proteins called histones. This image was taken shortly after DNA a replication but before the prophase. It is composed of two daughter chromatids joined at the centromere. The chromosome is super coiled by a factor around x16‚000. The DNA molecule is about 1
Premium Chromosome Meiosis DNA
1) What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? A) There is considerable genetic variation in garden peas. B) Traits are inherited in discrete units‚ and are not the results of "blending." C) Recessive genes occur more frequently in the F1 generation than do dominant ones. D) Genes are composed of DNA. E) An organism that is homozygous for many recessive traits is at a disadvantage. 2) How many unique gametes could be produced through
Premium DNA Chromosome Gene
MITOSIS What is Mitosis? There are various structures within the cell‚ but many are too difficult to see. For example‚ within the nucleus lie the chromosomes. These are important for heredity and reproduction. When a cell splits and becomes two‚ certain processes occur within the nucleus first. One of these processes involves the splitting of the chromosomes. This process is called Mitosis and there are four distinct stages. Mitosis takes place in Regular Body Cells or Somatic Cell. It keeps Cells
Premium Mitosis Chromosome Cell nucleus