An Individual With Naturally Curly Hair

Question: The best definition of a purebred plant is one that

Answer: self-fertilizes to produce offspring identical to the parent

Question: A mating between a purebred purple-flowered pea plant and a purebred white-flowered pea plant would produce

Answer: hybrid

Question: Alleles are described as

Answer: alternate versions of a gene

Question: A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The seeds of all of the offspring are yellow. Why?

Answer: The yellow allele is dominant to the green allele

Question: A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The F1 plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F1 × F1 cross?

Answer: 3:1

Question: According to Mendel’s law of segregation, ________.

Answer: gametes have one allele copy for each gene

Question: 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

Question: Mendel crossed purebred purple-flowered plants with purebred white-flowered plants, and all of the resulting offspring produced purple flowers. The offspring are all ________, and the allele for purple flowers is

Answer: heterozygotes… dominant

Question: Attached earlobes are recessive to free earlobes. What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

Answer: 50%

Question: In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?

Answer: Dd