Q6.1. Which statement below about asexual reproduction is FALSE?A)With asexual reproduction, offspring are genetically identical to the parent.B)Asexual reproduction requires no partner.C)Asexual reproduction requires meiosis.D)Some organisms can reproduce both sexually and asexually.Q6.2. If a diploid sperm fertilized a haploid egg, what would the result be?A)Haploid (n)B)Diploid (2n)C)A mixture of diploid (2n) and haploid (n)D)Triploid (3n)Q6.3. Which of the following represents two things that are identical?A)Two alleles for the same gene in a homologous chromosome pair.B)The sequences of DNA in the two sister chromatids of a chromosome before meiosis I.C)The sequences of DNA in the two sister chromatids of a chromosome after meiosis I.D)The number of homologous chromosomes per cell before and after meiosis I.Q6.4. What problem would most likely to occur if a haploid cell attempted to perform meiosis?A)The cell could not replicate its DNA prior to meiosis.B)The cell could not pair homologous chromosomes during meiosis I.C)The cell would produce diploid daughter cells.Q6.5. Which statement below is TRUE?A)Crossing over shuffles genes between non-homologous chromosomes.B)During meiosis, cells arrange their alleles so that beneficial alleles are passed on together.C)Without crossing over, offspring would be genetically identical to parents.D)New combinations of alleles arise from the random events of crossing over, independent assortment, and mutation.Q6.6. What statement below is TRUE of the spindle during mitosis and meiosis?A)The spindle always separates sister chromatids during anaphase.B)The spindle always separates homologous chromosomes during anaphase.C)Chromosomes are always attached to both spindle poles during metaphase.D)The spindle always attaches to chromosomes at the kinetochore.Q6.7. If a person is heterozygous for the Δ32 allele of the CCR5 gene, how many of the four daughter cells produced by meiosis will have the Δ32 allele?A)1B)2C)4D)VariesQ6.8. Which of the following processes has the effect of changing ploidy?A)DNA replicationB)Meiosis IC)Meiosis IID)Mitosis
The correct answer and explanation is:
Here are the correct answers along with explanations:
Q6.1. Which statement below about asexual reproduction is FALSE?
Correct Answer: C) Asexual reproduction requires meiosis.
Explanation: Asexual reproduction does not involve meiosis, which is a process necessary for sexual reproduction to produce haploid gametes. Instead, asexual reproduction involves mitosis, leading to offspring that are genetically identical to the parent. Many organisms, such as bacteria, fungi, and some plants, reproduce asexually through methods like binary fission, budding, and vegetative propagation.
Q6.2. If a diploid sperm fertilized a haploid egg, what would the result be?
Correct Answer: D) Triploid (3n).
Explanation: Normally, fertilization involves a haploid (n) sperm and a haploid (n) egg to form a diploid (2n) zygote. If a diploid sperm (2n) fertilizes a haploid egg (n), the resulting zygote would have three sets of chromosomes (3n), making it triploid. This condition often leads to developmental abnormalities and is generally not viable in humans.
Q6.3. Which of the following represents two things that are identical?
Correct Answer: B) The sequences of DNA in the two sister chromatids of a chromosome before meiosis I.
Explanation: Before meiosis I, each chromosome consists of two sister chromatids that are exact copies of one another due to DNA replication during the S phase of interphase. These chromatids remain identical until crossing over occurs during prophase I of meiosis.
Q6.4. What problem would most likely occur if a haploid cell attempted to perform meiosis?
Correct Answer: B) The cell could not pair homologous chromosomes during meiosis I.
Explanation: Meiosis relies on homologous chromosome pairing in meiosis I to ensure proper chromosome segregation. A haploid cell (n) has only one set of chromosomes and lacks homologous pairs, making it impossible to properly undergo meiosis.
Q6.5. Which statement below is TRUE?
Correct Answer: D) New combinations of alleles arise from the random events of crossing over, independent assortment, and mutation.
Explanation: Genetic variation arises from several processes: crossing over (exchange of genetic material between homologous chromosomes), independent assortment (random segregation of chromosomes), and mutation (random changes in DNA sequences). These mechanisms contribute to genetic diversity in offspring.
Q6.6. What statement below is TRUE of the spindle during mitosis and meiosis?
Correct Answer: D) The spindle always attaches to chromosomes at the kinetochore.
Explanation: The kinetochore is a protein structure on the chromosome where spindle fibers attach to facilitate chromosome movement during cell division. This attachment is essential for proper chromosome segregation in both mitosis and meiosis.
Q6.7. If a person is heterozygous for the Δ32 allele of the CCR5 gene, how many of the four daughter cells produced by meiosis will have the Δ32 allele?
Correct Answer: B) 2.
Explanation: A heterozygous individual has one normal allele and one Δ32 allele. During meiosis, homologous chromosomes segregate randomly, so two of the four daughter cells will inherit the Δ32 allele, and two will inherit the normal allele.
Q6.8. Which of the following processes has the effect of changing ploidy?
Correct Answer: B) Meiosis I.
Explanation: Meiosis I reduces ploidy from diploid (2n) to haploid (n) by separating homologous chromosomes. Meiosis II, in contrast, does not change ploidy but separates sister chromatids.
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Here is the detailed illustration depicting meiosis and asexual reproduction. Let me know if you need any modifications or explanations!
