BSC 1005 Exam 3 Study Guide Questions And Answers Verified 100% Correct

BSC 1005 Exam 3 Study Guide Questions And Answers Verified 100% Correct upon completion of telophase I and cytokinesis there are ______ cells - ANSWER -2 haploid which of the following occurs during prophase I but not prophase II - ANSWER tetrads form difference between mitotic anaphase and anaphase II - ANSWER -anaphase II=cells are haploid and sister chromatids seperate; mitotic anaphase = cells are diploid and homologous pairs seperate genetic variation is NOT increased by - ANSWER -the events of anaphase II anaphase I - ANSWER -homologous chromosomes seperate and migrate to opposite poles; which homologue goes to which pole is randome for a species with four pair of chromosomes, how many genetic combinations are possible - ANSWER -16 _________ represents sites of crossing over - ANSWER -chiasma crossing over during prophase I results in - ANSWER -genetic recombination how many chromosomes will a gamete produce as a result of nondisjunction - ANSWER -n +1 or n-1 what is the genetic complement of an individual with turner syndrome - ANSWER -2n-1 genetic material is duplicated during - ANSWER -s phase ______ is a carcinogen that may promote colon cancer - ANSWER -fat asexual reproduction requires ____ individuals - ANSWER -1 both mitosis and meiosis are preceded by - ANSWER -interphase which of these is NOT a component of meiosis - ANSWER -random fertilization when is amniocentesis usually done - ANSWER -between 14th and 20th week ______ is the trait most commonly found in nature - ANSWER -wild type true-breeding plants ---- - ANSWER -self-fertilize to produce offspring identical to the parent the mating between a pedigree chihuahua and a great dane would produce a - ANSWER -hybrid what are alleles - ANSWER -alternate forms of a gene a true breeding plant that produces yellow seeds is crossed with a true-breeding plant that produces green seeds. all of the seeds of all of the offspring are yellow. Why? - ANSWER -the yellow allele is dominant to the green allele what is the expected phenotypic ratio of seed color of the offspring - ANSWER 3:1 according to mendel's principle of segregation - ANSWER -gametes have one copy of each allele attached earlobes are recessive to free earlobes. what genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes? - ANSWER -1:1 attached earlobes are recessive to free earlobes. what phenotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes? - ANSWER -50& what is the phenotype of an individual who is heterozygous for dimples - ANSWER -Dd what name is given to the specific location of a gene on a chromosome - ANSWER -locus an individual who is homozygous - ANSWER -carries two copies of the same allele for a gene which of these crosses will only produce heterozygous offspring - ANSWER AAxaa an individual with the genotype AaBb produces four different gametes in equal proportions. this is a demonstration of _____ - ANSWER -law of independent assortment in order to determine the phenotype of an individual who expresses a dominant trait, you would cross that individual with an individual who is - ANSWER homozygous for that trait what is the probability that a couple's next child will be male - ANSWER -50% what is the expected phenotypic ratio of a cross between a RrYy and rryy individual - ANSWER -1:1:1:1 if an individual heterozygous for both of these traits were to mate with an individual with attached earlobes and no freckles, what is the probability of having a child with attached earlobes and freckles? - ANSWER -20% an individual heterozygous for cystic fibrosis - ANSWER -is a carrier