Practice Test: Mendelian Genetics 2023 Questions and Answers, Graded A+; --Mendelian Genetics quiz bank 2023

A plant with purple flower is allowed to self-pollinate. Generation after generation, it produces purple flowers. This is an example of: polygenetics the law of segregation incomplete dominance hybridization true-breeding - ANSWER true breeding For a monohybrid cross, if a homozygous recessive individual is crossed with a heterozygous individual, what is the chance of getting an offspring with the recessive phenotype? Assume simple mendelian inheritance. 25% 75% 50% 0% 100% - ANSWER 50% Mendel's laws of segregation and independent assortment were nearly impossible for biologists to fully understand until there was a general understanding of: mitosis meiosis. dominance. epistasis none of the above - ANSWER meiosis Alleles: are alternative forms of a gene. occur in a 3:1 ratio. don t affect the phenotypes until the F2 generation are present only in the F1 generation. are the result of hybridization. - ANSWER are alternative forms of a gene. In peas, purple flower color is dominant to white. A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers only. This demonstrates: a dihybrid cross true-breeding the blending model of genetics the mistakes made by Mendel dominance - ANSWER dominance In snapdragons, heterozygotes have pink flowers, whereas the two homozygotes have red flowers or white flowers. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers? 50% 75% 25% 100% 0% - ANSWER 100% Roan (rusty red) color in cattle is the result of incomplete dominance between red (R) and white (W) color genes. How would one produce a herd of pure-breeding roan-colored cattle? cross roan with white cross roan with roan cross roan with red cross red with white It cannot be done. - ANSWER It cannot be done P = purple, pp = white, The offspring of a cross of two heterozygous purple-flowering plants (Pp x Pp) results in: purple-flowered plants and white-flowered plants all pink-flowered plants, all white-flowered plants all purple-flowered plants, two types of white-flowered plants: pp and Pp - ANSWER purple-flowered plants and white-flowered plants Huntington's disease is caused by a dominant allele that is present at low frequency in human populations. If one of your parents has the disease, what is the probability that you, too, will have the disease? 1/4 1/2 3/4 1 (100%) - ANSWER 1/2 Albinism (lack of skin pigmentation) is caused by a recessive autosomal allele. A man and woman, both normally pigmented, have an albino child together. What is the genotype of the albino child? homozygous dominant