Instructional Technology Subsidy U.. DISMISS MULIIPLt CHUILE Why do males tend to inherit more sex-linked conditions than females? They have two Ychromosomes. They have more chromosomes than females C They have two Xchromosomes. D They only have one Xchromosome so they cannot be carriers. Artempt 2 of 2 All Changes Saved Bof 8 Total Questions Answered 43°F Sunny

Instructional Technology Subsidy U.. DISMISS MULIIPLt CHUILE Why do males tend to inherit more sex-linked conditions than females? They have two Ychromosomes. They have more chromosomes than females C They have two Xchromosomes. D They only have one Xchromosome so they cannot be carriers. Artempt 2 of 2 All Changes Saved Bof 8 Total Questions Answered 43°F Sunny

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter11: How Cells Reproduce

Section: Chapter Questions

Problem 1DAA: HeLa Cells Are a Genetic Mess HeLa cells can vary in chromosome number. Defects in proteins that...

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Stuck Sperm Cells lining the epididymis secrete a glycoprotein (beta-defensin) that coats sperm and facilitates their passage through cervical mucus. There are two common alleles for human beta-defensin: a wild-type allele (wt) and an allele with a deletion (del). To find out if this genetic variation could affect fertility, Gary Cherr and his colleagues tested the ability of sperm from men with different genotypes to pass through a gel barrier. The barrier was designed to simulate cenrical mucus. The researchers placed sperm on one side of the gel, then used a video camera to record how many passed into the gel over time. FIGURE 41.12 illustrates their results. FIGURE 41.12 Effect of beta defensin genotype on the ability of sperm to penetrate a gel that simulates cervical mucus. Sperm from 16 men was tested: 4wt/wt, 6wt/del, and 6 del/del. Fresh sperm were placed on one side of the gel, and a video camera was focused on a region 2.75 mm into the gel. The number of sperm in this region was recorded at one-minute intervals for six minutes. Sperm numbers shown are averages. Bars indicate range. After four minutes, how many sperm from men with a wild-type allele were in the camera's view an average?
Which of the following is not associated with sperm production? a. daughter cells identical to the parent cell b. variety in resulting cells c. chromosome number halved in resulting cells d. four daughter cells arising from one parent cell e. 23 chromosomes in the human sperm
A cell (2n = 8) is preparing to go through meiosis. Before S phase, this cell has _____. After S phase, this cell has _____.
Having extra sex chromosome can have less serious negative effects than having an extra autosome and some of the individuals can function within a normal range. However, for some of them is very difficult to expect normal life. Make some comparison between 45, X women and 45, Y.
When is the production of genetically identical offspring a disadvantage? Explain yourreasoning. please dont use copy pastes
HeLa Cells Are a Genetic Mess HeLa cells can vary in chromosome number. Defects in proteins that orchestrate cell division result in descendant cells with too many or too few chromosomes, an outcome that is one of the ha1lmarks of cancer cells. The panel of chromosomes in FIGURE 11.9, originally published in 1989, shows all of the chromosomes in a single metaphase HeLa cell. FIGURE 11.9 Karyotype of HeLa showing chromosomes in one cell. What is the chromosome number of this HeLa cell?
The ___ is a genetic dead end. a. polar body b. oocyte c. ovum d. sperm
Choose the statement that is incorrect. a. A son can inherit a recessive allele on an X chromosome from either parent. b. An individual may inherit three or more of each type of chromosome characteristic or the species, a condition called polyploidy. c. A female child inherits one X chromosome from her mother and one from her father. d. Pedigree analysis can be used to determine a future childs chance of being born with achcondroplasia.
BPA and Abnormal Meiosis In 1998, researchers at Case Western University were studying meiosis in mouse oocytes (germ cells) when they saw an unexpected and dramatic increase of abnormal events (FIGURE 12.6). Improper segregation of chromosomes during meiosis is one of the main causes or human genetic disorders. The spike in abnormal meiosis began right after the mouse facility started washing the animals' plastic cages and water bottles in a new, alkaline detergent. The detergent had damaged the plastic, which as a result was leaching bisphenol A (BPA). BPA is a synthetic chemical that mimics estrogen, the main female sex hormone in animals. Though it has since been banned for use in baby bottles, BPA is still widely used to manufacture other plastic items and epoxies (such as the coating on the inside of metal cans of food). BPA-free plastics are often manufactured with a related compound, bisphenol S (BPS), that has effects similar to BPA. FIGURE 12.6 Abnormalities in meiosis that occurred after exposure to BPA. Top, the most abnormal meiosis events occurred in mice that were housed in damaged plastic caging with damaged plastic bottles. Damaged plastic releases BPA. Bottom, fluorescent micrographs show the chromosomes (red) and spindle (green) in nuclei of mouse germ cells in metaphase I. A Normal metaphase; BD abnormal metaphase. What percentage of mouse oocytes displayed abnormalities of meiosis with no exposure to damaged caging?
The probability of a crossover occurring between two genes on the same chromosome ________. a. is unrelated to the distance between them b. decreases with increasing distance between them c. Increases with the distance between them
Analysis of X-Linked Dominant and Recessive Traits The X and Y chromosomes are structurally and genetically distinct. However, they do pair during meiosis at a small region near the tips of their short arms, indicating that the chromosomes are homologous in this region. If a gene lies in this region, will its pattern of transmission be more like that of a sex-linked gene or an autosomal gene? Why?
The DNA content in a diploid cell in G2 is X. If that cell goes into meiosis at metaphase II, the DNA content will be: a. 0.1 X. b. 0.5 X. c. X. d. 2X. e. 4X.