A man who is a carrier of a translocated 15/21 chromosome marries a genotypically normal woman. (1). Show the possible gametes that will be formed by this man if the translocated 15/21 chromosome synapses with chromosome 21 at Prophase I. (2). What is the probability that the first child of the couple will be a phenotypically normal girl? (3). What is the probability that the first child of the couple will be a genetically normal boy?

Q: Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one…

A: Down's syndrome occurs due to an error at the time of gamete formation. As a result the gametes may…

Q: If the amount (mass) of DNA in a diploid cell during G1 phase prior to meiosis I is 8 pg…

A: Cell cycle: - it is a series of changes occur in a newly divided cell through which it duplicates…

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

A: Hi! Since you have posted a question with multiple sub-parts, we will solve the first three…

Q: What does an extra chromosome 16 mean?

A: Chromosomes, the physical carriers of genes, are the microscopic thread like structures in which the…

Q: From 80% to 90% of the most common human chromosome abnormalities arise because the chromosomes fail…

A: The event where the two chromosomes fail to separate is called nondisjunction. This can take place…

Q: On average, what proportion of the genome in the following pairs of humans would be exactly the same…

A: Meiosis is a cell division through which gametes are produced. One diploid eukaryotic cell divides…

Q: During oogenesis, nondisjunction of X chromosome occurred in meiosis I. If the resulting egg unites…

A: Non disjunction is the failure of chromosomes / chromatids to separate during Anaphase. In Meiosis…

Q: (i)Draw a diagram of Metaphase I and II of meiosis in the father, which illustrates the only…

A: In this situation, we need to figure out the genes and processes that cause a particular child to…

Q: On average, what proportion of the genome in the following pairs of humans would be exactly the same…

A: Chromosomes are carrier of deoxyribonucleic acid (DNA). DNA is the genetic material. Each cell has…

Q: A husband and wife have normal vision, although both of theirfathers are red–green color-blind,…

A: Since you have posted a question with multiple sub-parts, we will solve the first three subparts for…

Q: If a dog cell (2n = 78) enters meiosis, how many chromosomes will be present in each daughter cell…

A: In Meiosis process , two divisions are involved that are Meiosis 1 and Meiosis 2.

Q: A woman with an abnormally long chromosome 13 (and a normalhomolog of chromosome 13) has children…

A: Since this is a disclaimer part with multiple questions, we will answer the first question alone…

Q: A female is heterozygous for an X-linked gene.  If nondisjunction happens for the sex chromosomes…

A: Introduction :  Aneuploidy is the term used to describe a cell that has an abnormally high/low…

Q: For a certain chromosomal region, the mean number of crossovers at meiosis is calculated to be two…

A: In the meiotic cell division process, a single germ cell divides twice to produce four non-identical…

Q: If the 2n chromosome number of an organism is 12: (a) what is the probability of having a spermatid…

A: Probability is equal to number of outcomes divided by total possible outcomes. Diploid number of…

Q: Scenario 2: Down's syndrome can be caused by either a trisomy of chromosome 21 (2n=47 (+21)) or a…

A: Down syndrome is a genetic disorder that can be caused by two main mechanisms:Trisomy 21: This is…

Q: C29. A female with an abnormally long chromosome 13 (and a normal homolog of chromosome 13) has…

A: Egg cells: A female with a long chromosome 13 can produce two types of egg cells:50%: Normal egg…

Q: Fetuses whose cells are triploid, that is, contain three full sets of chromosomes, develop to term…

A: INTRODUCTION The DNA molecule is packed into thread-like structures called chromosomes in the…

Q: Although triple-X human females typically have normal offspring, what kinds of gametes, with respect…

A: Introduction In humans, the X chromosome is one of two sex chromosomes, the other is the Y…

Q: Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a…

A: Chromosomal deletion syndrome occurs when whole or part of chromosomes are missing. Turner Syndrome…

Q: An organism has a diploid number of 16 in a primary oocyte. (a) How many tetrads are present in the…

A: Meiosis causes a reduction in chromosome number by half. It involves the recombination and pairing…

Q: Suppose you discover two interesting rare cytological abnormalities in the karyotype of a human…

A: To find: To find the proportion that has the same karyotype using the given pair of chromosomes

Q: A couple is planning to have three children. What is the probability of having all boys? *

A:

Q: A color-blind woman with Turner syndrome (XO) has a father who is color blind. Given that the gene…

A: Given that the gene for the color-blind condition is recessive and X-linked and a color-blind woman…

Q: Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a…

A: Dihybrid cross involves two genes in a cross. That's why the two traits are involved in this cross.

Q: A family has an X-linked dominant form of congenital generalizedhypertrichosis (excessive…

A: Genes are the functional unit of DNA. It contains information that is transferred from one…

Q: Which, if any, of the following sex-chromosome aneuploids in humans are fertile: XXX, XXY, XYY, XO?

A: Aneuploids are a kind of chromosomal mutations which results in abnormal number of chromosomes.

Q: The human contains 23 pairs of homologous chromosomes, all of which are indepently assorted. What do…

A: During the process of meiosis, male and female gametes are formed. In meiosis, DNA is being…

Q: For a certain chromosomal region, the mean number ofcrossovers at meiosis is calculated to be two…

A: For a certain chromosomal region, the mean number ofcrossovers at meiosis is calculated to be two…

Q: Show via a diagram how the product(s) of a meiotic (either I or II) nondisjunction involving the X…

A: Kilnefelter's Syndrome:  Klinefelter's syndrome is a genetic disorder in which a boy is born with an…

Q: Explain why a person with Klinefelter Syndrome (XXY) still exhibits abnormal phenotypes despite the…

A: The human sex is determined at the time of fertilization in the fallopian tube of the female…

Q: In an organism with a haploid number of 7, how many possible combinations of maternal and paternal…

A: Meiosis is a special type of cell division of germ cells in sexually-reproducing organisms used to…

Q: The X and Y chromosome will not be the same size. What are the implications of this with respect to…

A: Most Y chromosomes do not undergo standard recombination. But .there is a single obligatory…

Q: How many different types of gametes can you produce from this cell heterozygous for two genes…

A: Aa is one gene and Ff is another gene. The gene contains two different alleles, hence it is called…

Q: The letters below represent genes found on different chromosome pairs. Letters that are similar…

A: The alleles are the alternative forms of a gene that are located on the same locus of a homologous…

Q: For each of the following human sex chromosome combinations, indicate whether you would expect them…

A: The determination of a baby's sex is determined by the combination of sex chromosomes they inherit…

Q: You are an allele on a single uncondensed chromosome in a Yellow fever-carrying mosquito (Aedes…

A: The somatic cells follow the mitotic process for division and the reproductive cells or gametes are…

Q: Which of the following karyotypic sex chromosome abnormalities result(s) in a male phenotype?…

A: Genetic diseases are caused by mutations in genes.

Q: You are an allele on a single uncondensed chromosome in a Yellowfever-carrying mosquito (Aedes…

A: The fundamental and active process by which a parent cell after replication of its components,…

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…

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.