Biology Genetics Vocabulary All Answers Correct

Biology Genetics Vocabulary All Answers Correct 1. What is a gene? - Answer: A gene is a segment of DNA that encodes for a protein and influences a specific trait in an organism. 2. How would you define a trait? - Answer: A trait is a particular characteristic that can differ among individuals within a species. 3. What is an allele? - Answer: An allele is a variant form of a gene. 4. What does it mean when a trait is described as dominant? - Answer: A dominant trait is one that will be expressed in the phenotype of an organism whenever the corresponding gene is present. 5. How is a recessive trait characterized? - Answer: A recessive trait will only manifest in the phenotype if the organism inherits two copies of that trait, as it is concealed by the dominant allele. 6. What is a gamete? - Answer: A gamete is a reproductive cell, specifically a sperm or egg. 7. What does hybrid refer to in genetics? - Answer: A hybrid describes the offspring resulting from a cross between parents with different traits, indicating a heterozygous genetic makeup. 8. What is meant by phenotype? - Answer: Phenotype refers to the observable physical traits of an organism. 9. What is the purpose of a Punnett square? - Answer: A Punnett square is a graphical tool used to predict the potential genetic outcomes of a cross between two parents, displaying the gametes of each parent along the axes and the offspring's genotypes within the grid. 10. How is genotype defined? - Answer: Genotype describes the genetic composition of an organism, specifying the particular alleles present. 11. What does it mean to be homozygous? - Answer: An individual is considered homozygous if it possesses two identical alleles for a specific trait, which may be referred to as true-breeding or purebred (e.g., PP or pp). 12. What is heterozygous? - Answer: A heterozygous organism has two different alleles for a given trait, also known as a hybrid (e.g., Pp). 13. What are multiple alleles? - Answer: Multiple alleles refer to a scenario in which three or more variations of a gene exist for a particular trait. 14. What is incomplete dominance? - Answer: Incomplete dominance occurs when a blend of phenotypes is produced, indicating that neither allele is completely dominant over the other. 15. What defines a polygenic trait? - Answer: A polygenic trait is influenced by two or more genes, resulting in a broad spectrum of phenotypes. 16. What is codominance? - Answer: Codominance is when both alleles contribute equally to the phenotype of the organism, leading to characteristics such as spotted or striped patterns. 17. Can you explain nondisjunction? - Answer: Nondisjunction is an error that occurs during meiosis when homologous chromosomes fail to separate properly, resulting in gametes with an incorrect number of chromosomes. 18. What is a sex-linked trait? - Answer: A sex-linked trait is associated with a gene located on the X or Y chromosomes.