Or each chromosome of a pair can be individually picked. 16. Explain two ways in which children can have different chromosomes (gene variation) than their mother or father. Random separation of chromosomes (law of segregation) when forming sperm/ova during anaphase I, crossing over of some genes to the homologous chromosomes during prophase I, and mutation during S
Since the chromosome pairs carry different genes, the daughter cells (sex cells) produced by meiosis are almost always genetically different. See Biozone. 3.5 Explain the role of gamete formation and sexual reproduction in variability of offspring Genetic variability of offspring occurs for a number of reasons: 1. During sexual reproduction, two sex cells join together in a process called fertilization. Which sex cells join together during fertilization is a random process.
Comparison chart | Meiosis | Mitosis | Definition: | A type of cellular reproduction in which the number of chromosomes are reduced by half through the separation of homologous chromosomes in a diploid cell. | A process of asexual reproductionin which the cell divides in two producing a replica, with an equal number of chromosomes in haploid cell | Function: | sexual reproduction | Cellular Reproduction & general growth and repair of the body | Type ofReproduction: | Sexual | Asexual | Occurs in: | Humans, animals, plants, fungi | all organisms | Genetically: | different | identical | Crossing Over: | Yes, mixing of chromosomes can occur. | No, crossing over cannot occur.
The crossing in the F2 generation of the heterozygous male and heterozygous female produced two heterozygous offspring, one homozygous recessive offspring and one homozygous dominant offspring. Discussion This experiment was conducted by using aldehyde oxidase (AO) to genetically characterize the aldox gene. It was hypothesized that the gene
c. Incomplete dominance introduces a third phenotype for a gene with two alleles. d. Codominance introduces a third phenotype for a gene with two alleles. e. Epistasis eliminates a progeny class when a gene masks another's expression. f. Incomplete penetrance produces a phenotype that does not reveal the genotype. g. Variable expressivity can make the same genotype appear to different degrees.
BIO 105160 Chapter 9/Lab 7 Homework Review Questions 1. What is a sexlinked trait? Why are more males than females affected by Xlinked recessive traits? With your answer in mind, what must be true for a particular Xlinked recessive trait to be expressed in a female? SexLinked trait: Sex linkage is the phenotypic expression of an allele related to the chromosomal sex of the individual.
Know the cell cycle regulation. Know what telomeres are What is cancer and tumor Know what apoptosis is Chapter 9 What is reproduction What is the difference between asexual and sexual reproduction What are the advantages and disadvantages of asexual and sexual reproduction What is meiosis Know the different stages of meiosis What is fertilization What are germ cells Know what is crossing-over is Know what is polyploidy and nondisjuction is. Chapter 10 Know what a gene and allele are Know who is Mendel and what he did Know Mendel’s Laws Know the difference between a punnett square, test cross, and a dihybrid cross. Know how incomplete dominance, codominance, pleiotropy, polygenetic traits, epistasis, and the environment can affect phenotype. Chapter 40 What is a community?
Association words: genes, coded, genetic, punctuation 10) Sex chromosome – The X and Y chromosomes that determine our physical sex characteristics. Association words: 46 chromosomes, X and Y, phenotype 11) Neuron – Cell specialized to receive and transmit information to other cells in the body Association words: nerve cell, information, decide 12) Sensory neuron – Nerve cell that carries messages from sense receptors toward the central nervous system. Association words: afferent neuron, carry, toward, brain 13) Motor neuron – Nerve cell that carries messages away from the central nervous system toward the muscles and glands. Association words: efferent neuron, message, muscles, organs, glands 14) Interneuron – A nerve cell that relays messages between nerve cells, especially in the brain and spinal cord. Association words: cells, spinal cord 15) Dendrite – A branched fiber that extends outward from the main cell body and carries information into the neuron.
These traits are carried on alleles, and we are given one by each parent. If both alleles have the same trait, then you are homozygous for the gene. If there are two different alleles, then you are heterozygous for the gene. A particular gene can be dominate, which means it will express. However we often share hidden traits as well, called recessive traits.
DNA plays a role inheritance because it is established at conception. An example of a dominant and recessive genetic disorder is Sickle cell. An example of an x- linked disorder is Hemophilia A and Goltz Syndrome. An example of a y-link disorder is Color Blindness and Male Infertility. Genetics help predict disease, according to Lind McDonald Glenn by predicting future rick of disease.