In a certain plant, red flowers are dominant over white flowers. A plant heterozygous for red flowers and a plant with white flowers are crossed. Which of the following is the expected proportion of phenotypes in the next generation?
A. 1 red, 3 white
B. 4 red, 0 white
C. 2 red, 2 white
D. 3 red, 1 white
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The law of segregation states that each individual has two alleles for each trait, and these alleles separate during gamete formation. The allele that each gamete receives is random. Therefore, the probability of getting a certain genotype or phenotype depends on the Punnett square. In this case, the plant heterozygous for red flowers has the genotype Rr, where R is the dominant allele for red flowers and r is the recessive allele for white flowers. The plant with white flowers has the genotype rr. half of the offspring will have the genotype Rr and half will have the genotype rr. Since R is dominant over r, the offspring with Rr will have red flowers and the offspring with rr will have white flowers. Therefore, the expected proportion of phenotypes in the next generation is 2 red, 2 white.
Therefore, the Correct Answer is C.
More Questions on TEAS 7 Practice Exam 4
Question 1:
Which of the following are the two major parts of the nervous system?
A. Autonomic nervous system and central nervous system
B. Peripheral nervous system and central nervous system
C. Peripheral nervous system and somatic nervous system
D. Autonomic nervous system and somatic nervous system
The Correct Answer is B.The nervous system is divided into two major parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord, while the PNS consists of all the nerves outside of the CNS.
Question 2:
The measurement indicated by the line across the center of the cell is best referred to as which of the following?
A. Diameter
B. Volume
C. Area
D. Radius
The Correct Answer is A.One way to assess the size of a cell is to measure its diameter, which is the length of a straight line that passes through the center of the cell and touches both sides. The measurement indicated by the line across the center of the cell in the diagram is best referred to as the diameter of the cell.
Question 3:
In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?
A. ffx ff
B. Ffx Ff-
C. Ff x ff
D. FFX FF
The Correct Answer is A.To produce only offspring with smooth leaves, the parents must both have two copies of the recessive allele (f) for this trait.
Question 4:
Which of the following can lead to a tsunami?
A. Lightning strikes
B. Flooding
C. Earthquakes
D. Sunspot activity
The Correct Answer is C.A tsunami is a series of large waves that are caused by the displacement of a large volume of water in the ocean or a large lake. The most common cause of tsunamis is earthquakes, which can generate seismic waves that travel through the water and create sudden changes in water level.
Question 5:
Which of the following are used to determine a person's DNA sequence?
A. Enzymes
B. Blood types
C. Genes
D. Hormones
The Correct Answer is C.Genes are used in techniques like DNA sequencing to determine a person's DNA sequence. DNA sequencing involves determining the order of nucleotides (A, T, C, and G) in a DNA molecule. Genes are used to replicate and amplify DNA segments, allowing researchers to analyze the sequence of nucleotides present in a person's DNA
Question 6:
Which of the following best describes the result of using a catalyst in a chemical reaction?
A. The reaction is completed in a shorter amount of time.
B. The yield of product is increased.
C. A greater amount of heat energy is released by the reaction.
D. A more desirable product is often formed.
The Correct Answer is A.A catalyst is a substance that lowers the activation energy of a chemical reaction, which means that it allows the reaction to proceed faster without being consumed or changed itself. A catalyst does not affect the equilibrium of a reaction, so it does not change the amount or the type of product that is formed.
Question 7:
Which of the following is the atomic number of an atom that has 12 protons and 12 neutrons?
A. 24
B. 1
C. 12
D. 144
The Correct Answer is C.The atomic number of an atom is defined as the number of protons in its nucleus. Protons are positively charged particles that make up part of the atomic mass, along with neutrons, which have no charge. The number of neutrons can vary for atoms of the same element, resulting in different isotopes. However, the number of protons is always constant for a given element. Therefore, to find the atomic number of an atom that has 12 protons and 12 neutrons, we only need to look at the number of protons.
Question 8:
Testosterone is categorized as which of the following types of hormones?
A. Progestin
B. Androgen
C. Aldosterone
D. Estrogen
The Correct Answer is B.Testosterone is a hormone that belongs to the class of androgens, which are responsible for the development and maintenance of male characteristics. Androgens are synthesized from cholesterol and can be converted into other types of hormones, such as estrogens and progestins. Aldosterone is a different type of hormone that regulates the balance of salt and water in the body.
Question 9:
The cytoskeleton of a cell is comprised of which of the following macromolecules?
A. Carbohydrates
B. Nucleic acids
C. Proteins
D. Lipids
The Correct Answer is C.The cytoskeleton of a cell is a complex network of filaments and tubules that provides structural support, shape, movement, and organization to the cell and its components.
The cytoskeleton is composed mainly of proteins, which are macromolecules made of amino acids linked by peptide bonds. The three main types of proteins that form the cytoskeleton are microtubules, microfilaments, and intermediate filaments. Each type has a different structure, function, and distribution within the cell.
Question 10:
Which of the following is a mass within the ovary that secretes hormones to maintain the uterine lining during pregnancy?
A. Oviduct
B. Corpus luteum
C. Oocyte
D. Umbilical cord
The Correct Answer is B.Corpus luteum. The corpus luteum is a temporary structure that forms from the ruptured follicle after ovulation. It produces progesterone, which is a hormone that prepares the endometrium (the inner lining of the uterus) for implantation of a fertilized egg. If pregnancy occurs, the corpus luteum continues to secrete progesterone until the placenta takes over.
