A karyotype shows that a child has Klinefelter syndrome (47,XXY). If the child is also colorblind (due to a recessive X-linked allele), despite his parents having normal color vision, in which parent and stage of meiosis did nondisjunction occur? And explain why .

Q: In meiosis, after telophase I, do other cells (comparing one another) have the same combination of…

A: Cell cycle consists of stages of cell growth and reproduction. In M phase of cell cycle, cell…

Q: ume the child's chromosome abnormality arose from one nondisjunction event in meiosis. In which…

A: Color blindness is the decreased ability to see color or differences in color.It is typically an…

Q: If nondisjunction occurs in a chromosome pair, what will be its effect on the gametes and the…

A: Nondisjunction occurs when homologous chromosomes or sister chromatids fail to divide properly…

Q: Bob has XXY chromosomes (Klinefelter syndrome) and is color blind. His mother and father have normal…

A: Colorblindness is an X-linked recessive disorder. Klinefelter syndrome is the presence of two copies…

Q: Which event takes place during anaphase II of meiosis?

A: Meiosis is a nuclear division in which a parent cell gives rise to four genetically distinct…

Q: Identify the variation of gametes from the genotype Aa Bb CC?

A: Genotype is a genetic combination of trait in an organism. The law of inheritance (mendel) is…

Q: Which pair number represents the sex chromosomes?

A: The karyotype is the type of chromosomes or number of chromosomes present in the nucleus of a…

Q: An individual named Pat with Prader-Willi syndrome produced anoffspring named Lee with Angelman…

A: Prader-Willi syndrome and Angelman syndrome are two different disorders which are associated with…

Q: Below is a diploid cell in meiosis. a. How many 'a' alleles are present in Anaphase 1? b. How many…

A: A cell undergoes cell division to make daughter cells .For cell division it must undergo replication…

Q: According to Figure 2, what is the probability that the next child of couple II.4 and II.5 would…

A: Pedigree is defined as a diagram that will show the lineage of an organism and all the direct and…

Q: A diploid organism is heterozygous for 4 loci, how many types of gametescan be produced?

A: Loci refer to the fixed position on a chromosome. Heterozygous organisms have different alleles for…

Q: Male-pattern baldness is an X-linked recessive trait (Xb). A father with a genotype XBY and a mother…

A: The DNA (deoxyribonucleic acid) is the hereditary material of an organism. The DNA is a part of the…

Q: What is the relationship between non-disjunction, changes in chromosome number and miscarriage?  Why…

A: Chromosome abnormalities are of 2 types viz. numerical, where an individual has abnormal number of…

Q: The genotype XO corresponds to:

A: Genetic disorders are inherited disorders. In genetic disorders, the disorders related to sex…

Q: Explain why the daughter cells produced by meiosis NEED to be genetically different from each other,…

A: All the events occur during cell division through which a cell divides into two daughter cells is…

Q: How does the law of segregation reflect the events of meiosis?

A: Law of segregation: This is one of the laws of Gregor Mendels Law of Inheritance. This law says that…

Q: A meiotic-nondisjunction causes trisomy 8 in a newborn.  If two of the three copies of chromosome 8…

A: When the homologous chromosomes fail to separate during the meiosis I stage, this will result in…

Q: In humans, curly hair (HH) is incompletely dominant over straight hair (hh), so heterozygous…

A: Curly hair (HH) is incompletely dominant over straight hair (hh). So heterozygous individual show…

Q: Could an individual with blood type O (genotype ii) be a legitimate child of parents in which one…

A: The ABO blood group system is present in human beings. There are four blood groups in the system,…

Q: How does meiosis explain the first law of Mendel?

A: The process in which the single cell divides twice in order to produce four cells consisting half…

Q: How does the law of independent assortment reflect the events of meiosis?

A: The Principle of Independent Assortment explains how different genes differentiate from one another…

Q: List some syndromes that result from inheritance of anabnormal sex chromosome number

A: Sexual defects in chromosomes are sex-specific. Normal males inherit a chromosome of X and Y, while…

Q: In which parent and during which meiotic division did non-disjunction occur? If there is more than…

A:

Q: From this pedigree is it dominant or recessive. Is ur autosomal or sex-linked?

A: Pedigree is define a diagrammatic representation of the individuals of a family for a particular…

Q: For the following chromosome complements, what is the phenotypic sex of a person who has Q. XX with…

A: The sex-determining region Y (SRY) is located on the short branch of the Y chromosome, which…

Q: Assume that meiotic nondisjunction event causes trisomy 8 in a newborn. If two of the three copies…

A: Nondisjunction is that the failure of the chromosomes to separate, that produces daughter cells with…

Q: What are the possible gametes for the following two parents? Father (Gghh) Mother (GGHH)

A: Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half…

Q: One gene has alleles A and a: another gene has alleles B and b. For each of the following genotypes,…

A: Every character is controlled by a gene which has two alleles. The dominant allele can express…

Q: If a cell has a diploid number of twelve (2N = 12) before meiosis, how many chromosomes will be in…

A: The process by which two sets of chromosomes migrate in the same pole during segregation (gamete…

Q: Which phase is the shortest and the longest in "meiosis"?

A: Meiosis is a kind of cell division that takes place in sexually reproducing organisms which results…

Q: A woman who is homozygous for normal color vision mates with a colorblind male. they produce a…

A: Color blindness is an X-linked recessive genetic disorder. In this disease, the person has less…

Q: ) How many possible gametes could a person with the following genotypes produce? a. AaBbCc b.…

A: Gamete formation is the process in which the copy of all the genetic information is made. Meiosis is…

Q: At what stage of meiosis (I or II) does crossing-over occur?

A: Crossing-over is a process that occurs during meiosis (I or II) whereby homologous chromosomes…

Q: Which of the four daughter cells shown at right would produce an offspring with trisomy 3 after it…

A: The correct option is explained below.

Q: A diploid organism has five pairs of chromosomes in each somatic cell. Assuming that no crossing…

A: When the DNA molecule is well organized and packaged into thread-like structures in the nucleus of…

Q: During meiosis, does random assortment occur before or after crossing-over?

A: Meiosis is the cell division that includes meiosis I and meiosis II without any DNA replication…

Q: Which of the following statements is an incorrect description of the processes of mitosis or meiosis…

A: Answer:

Q: Assuming that independent assortment occurs during meiosis, what type(s) of gametes will form in…

A: A gene is a fundamental unit of heredity, holding coded information associated with a certain…

Q: a. If cell division during gametogenesis is non-meiotic, what is its consequence to the future…

A: A diploid somatic cell undergoes mitosis. a mitotic division results in two daughter cells which are…

Q: Trisomy 21, or Down's syndrome, is the result of which event occurring during the meiotic process?

A: Ans. A nucleus, where genetic material is contained in genes, is located on every cell in the human.…

Q: Explain how nondisjunction in meiosis is responsible for chromosome abnormalities such as Down…

A: Amongst all the chromosomal disorders, deformities in chromosome number are very easily recognisable…

Q: During which phase of meiosis do alleles of a gene separate? Does it occur in meiosis I or II?

A: Anaphase 1 is the third stage of Meiosis I and it occurs after prophase I and metaphase I.

Q: Why are the homologous regions of the X and Y chromosome important during meiosis?

A: One of the defined types of cell divisions characterized by the occurrence of two rounds of division…

Q: How might abnormal meiosis lead to alterations in chromosome number or structure?

A: A total of 46 chromosomes (or 23 pairs of chromosomes) are found in nearly every cell in our body.…

Q: If the mother has normal color vision but her daughter has red-green colorblindness, what must be…

A: The red green color blindness is a X linked recessive trait.  Let XC encodes normal phenotype. And…

Q: A woman with type A blood marries a man with type O blood. They have six children, all of whom have…

A: In diploid organisms there is place for fitting of two alleles even through there are 3 or 4 alleles…

Q: True or False. Meiosis is responsible for producing the brown structure sen in the picture provided…

A: The kingdom fungi consist of numerous phylum of nonphotosynthetic, chitin walled organisms…

Q: what is Meiotic Nondisjunction?

A: Meiosis is also known as a double division that occurs in a diploid cell and gives rise to four…

Q: Colour blindness is a recessive sex-linked trait found on the X chromosome. Suppose a colour blind…

A: Humans carry 22 pairs of autosomes and one pair of sex chromosomes. The sex chromosomes present in…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.