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The offspring of an AA x Aa cross are either AA or Aa. If an organism that is homozygous dominant is crossed with a heterozygote for that trait, the offspring will be _. If all the progeny show the dominant phenotype, the parent must have been homozygous, transmitting the dominant allele to all of the offspring.
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The parent with the dominant phenotype was homozygous. What is indicated when a single-character testcross yields offspring that all have the dominant phenotype? If one parent has the genotype Tt and the other parent has the genotype tt, about half of the offspring will be tall. The ratio of tall offspring to short offspring is 1:1. Which outcome below would indicate that the tall parent plant was heterozygous? A tall plant is mated with a short plant. Pea plants are tall if they have the genotype TT or Tt, and they are short if they have genotype tt. A plant with the genotype AABbcc will have the same phenotype as a plant with the genotype _. In a certain plant, the alleles A, B, and C are completely dominant to the alleles a, b, and c. Unless a mutation has occurred during DNA synthesis, sister chromatids will always carry the same allele. The F1 generation differed from the F2 in Mendel’s experiments in that _.Īll of the F1 showed the dominant phenotype, but only three-fourths of the F2 didĭifferent alleles are different DNA sequences found at the same locus on homologous chromosomes. The tall allele is completely dominant to the dwarf allele. If a homozygous dominant individual is crossed with a homozygous dwarf, the offspring will _. The conclusion is that the cross must be AArr x aaRr.Īssume tall (T) is completely dominant to dwarf (t) in a certain species of plant. Because half the apples are red and half are yellow, the red parent must be heterozygous for red. Because all the offspring are big, the big parent must be homozygous for A. Trees that produce small red apples could be aaRR or aaRr.
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Trees that produce big yellow apples could be AArr or Aarr. When the two are crossed, you find that half of the new trees produce big red apples and half produce big yellow apples. You have one tree that produces big yellow apples and another tree that produces small red apples. All the progeny would show the same phenotype.Ī = big apples R = red apples a = small apples r = yellow apples.
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If the plant were allowed to self-pollinate, all of the progeny would have the dominant trait If a plant variety is true-breeding for a dominant trait, then _. The blending inheritance hypothesis, but not the particulate hypothesis, maintained that after a mating, the genetic material provided by each of the two parents is mixed in the offspring, losing its individual identity. Phosphorus is used to construct the basic building blocks of life, such as carbohydrates, lipids, and nucleic acids.Which choice below is a basic difference between Mendel’s particulate hypothesis and the hypothesis of blending inheritance? It is also used to construct ATP and GTP. Oxygen is used to construct the basic building blocks of life, such as carbohydrates, lipids, and nucleic acids. Nitrogen is used to construct the basic building blocks of life, such as amino acids, nucleic acids, and proteins. Hydrogen is also used to construct ATP and GTP. Hydrogen is used to construct the molecules water and organic compounds with carbon. Carbon is also used to construct the energy-rich molecules adenosine triphosphate (ATP) and guanosine triphosphate (GTP). Even the cell membranes are made of proteins. Carbon is an important element for all living organisms, as it is used to construct the basic building blocks of life, such as carbohydrates, lipids, and nucleic acids. These elements form the basic building blocks of the major macromolecules of life, including carbohydrates, lipids, nucleic acids and proteins. The first four of these are the most important, as they are used to construct the molecules that are necessary to make up living cells. They are carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur. In biology, the elements of life are the essential building blocks that make up living things.