Ch.11 Genetics
Quiz by Kate Downey
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45 questions
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- Q1Mendel believed that the characteristics of pea plants are determined by the:inheritance of units or factors from one parentrelative health of the parent plants at the time of pollinationinheritance of units or factors from both parents30sEditDelete
- Q2An allele is:one of several possible forms of a geneanother word for a genea homozygous genotypea heterozygous genotype30sEditDelete
- Q3Phenotype refers to the ______________________ of an individual.genetic makeuprecessive allelesdominant allelesactual physical appearance30sEditDelete
- Q4When the genotype consists of a dominant and a recessive allele, the phenotype will be like _________________ allele.boththe dominantneitherthe recessive30sEditDelete
- Q5Assuming that both parent plants in the diagram below are homozygous, why would all of the f1 generation have yellow phenotypes?because both parents passed on yellow allelesbecause the f1 genotypes are homozygousbecause both parents passed on green allelesbecause yellow is dominant over green30sEditDelete
- Q6The idea that different pairs of alleles are passed to offspring independently is Mendel's principle of:unit inheritancelaw of segregationlaw of independent assortmentlaw of dominance30sEditDelete
- Q7In the diagram below, what accounts for the green pea seed in the f2 generation?The f1 generation parents are homozygous yellow.On average, 1 out of 4 offspring of heterozygous parents will be homozygous recessive.The f1 generation parents are homozygous green.The yellow allele is dominant over the green one.30sEditDelete
- Q8The idea that for any particular trait, the pair of alleles of each parent separate and only one allele from each parent passes to an offspring is Mendel's principle of:law of independent assortmentlaw of segregationlaw of dominancehybridization30sEditDelete
- Q9Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons except thatmany of the observable characters that vary in pea plants are controlled by single genes.peas show easily observed variations in a number of characters, such as pea shape and flower colorpeas have an unusually long reproduction timeit is possible to completely control matings between different pea plants.30sEditDelete
- Q10A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstratesa dihybrid cross.the blending model of genetics.true-breedingdominance30sEditDelete
- Q11What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?Genes are composed of DNATraits are inherited in discrete units, and are not the results of "blending.An organism that is homozygous for many recessive traits is at a disadvantage.There is considerable genetic variation in garden peas30sEditDelete
- Q12Which of the following is (are) true for alleles?They can represent alternative forms of a geneThey can be identical(AA) or different(Aa) for any given gene in a somatic cell.All of the following are true for alleles.They can be dominant or recessive.30sEditDelete
- Q13Two plants are crossed, resulting in offspring with a 3:1 phenotype ratio for a particular trait. This suggestsThat the parents were both heterozygous.That the parents were true-breeding for contrasting traits.That each offspring has the same alleles.That a blending of traits has occurred30sEditDelete
- Q14A 9:3:3:1 phenotypic ratio is characteristic of which of the following?dihybrid crossmonohybrid crosslinked genestrihybrid cross30sEditDelete
- Q15When crossing a homozygous recessive with a heterozygous organism, what is the chance of getting an offspring with the homozygous recessive phenotype?75%25%50%0%30sEditDelete
- Q16In a particular plant, leaf color is controlled by gene D. Plants with the dominant allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of this cross is diagrammed in the Punnett square shown below, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with dark leaves?2 and 31 and 21,2 and 31,2,3,4120sEditDelete
- Q17Which of the boxes correspond to plants with a heterozygous genotype?2 and 41 and 42 and 31 and 3120sEditDelete
- Q18PP,Pp= purple, pp= white. The offspring of a cross between two heterozygous purple-flowering plants (Pp×Pp) results inall purple-flowered plants.two types of white-flowered plants: PP and Pp.all white-flowered plants3 purple-flowered plants and 1 white-flowered plants120sEditDelete
- Q19What are Punnett squares used for?predicting the result of genetic crosses between organisms of known genotypesdetermining the DNA sequence of a given geneidentifying the gene locus where allelic variations are possibletesting for the presence of the recessive allele120sEditDelete
- Q20Which of the following is false, regarding the law of segregation?It can account for the 3:1 ratio seen in the F2 generation of Mendel's crosses.It is a method that can be used to determine the number of chromosomes in a plant.It can be explained by the segregation of homologous chromosomes during meiosisIt states that each of two alleles for a given trait segregate into different gametes.120sEditDelete
