QUESTION 2 Listed below are some sex chromosome combinations. For each combination, state whether the individual is male or female in humans and also in Drosophila (assume the flies have two sets of autosomes). Chro mos ome s XXX XY XO XXY Humans Drosophila
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Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
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- QUESTION 13 Assume that a diploid cell (2N=8) contains 4 pairs of chromosomes (3 pairs of autosomes and 1 pair of sex chromosomes) designated as 1m, 1p, 2m, 2p. 3m, 3p, Xm, and Xp where "m" stands for maternal origin and "p" stands for paternal origin. If nondisiunction for the Xm chromosome ocurred in meiosis I, what will be a likely chromosomal composition of the resulting 2 daughter cells at the end of this cycle? O 1m, 2p, 3p, Xm, Xp AND 1p, 2m, 3m, Xm, Xp O 1m, 2p, 3p, Xm, Xp AND 1р, 2m, 3m O im, 1m, 2p, 2p, 3p, 3p, Xm, Xm, Xp, Xp AND 1p, 1p, 2m, 2m, 3m, 3m, Xm, Xm, Xp, Xp O 1m, 1m, 2p, 2p, 3p, 3p, Xm, Xm, Xp, Xp AND 1p, 1p, 2m, 2m, 3m, 3mQuestion 4 Consider a diploid organism with a diploid number of 30. Show your work and/or explain logic on all parts. a. How many total chromatids will be present in a typical cell at mitotic metaphase? b. How many tetrads are present in a metaphase I cell of meiosis? c. How many dyads are present in a metaphase II cell in meiosis? d. How many monads are expected in each product cell at the end of meiosis II?Question 26 refers to QTL on the cricket autosomes. Forthe sex chromosomes, females crickets are XX and malescrickets are XO, having just one X chromosome but noY chromosome. Can QTL for pulse rate be mapped oncricket X chromosomes? If the song is only sung by malecrickets, can the dominance effects of QTL on the X beestimated?
- Question 3: A woman suffers from albinism and is also a carrier for haemophilia. Draw a well- labelled diagram of a cell in Metaphase depicting the relevant chromosomes associated with these conditions. Identify the specific chromosomes (consult previous lectures) associated with these conditions. Your diagrams should clearly indicate the chromatids, chromosomes, genotypes, alleles, and cell structure needed in Metaphase. Use A/a to indicate alleles associated with albinism and H/h for haemophilia.QUESTION 1 Consider a diploid species with a diploid number of 30. Show your work and/or explain logic on all parts. 2 How many chromatids would be found in a cell that is in Prophase II of meiosis? b fatpical dplod cel,in G of the cell cycle, from this species contains DNA with a mass of 10 picograms, how many picograms of DNA would be in a bypical gamete? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUSParagraph Arial 14px In !!!Drosophila melanogaster, the common fruit fly, has 4 chromosomes in each of its gametes. How many chromosomes are in each somatic cell?
- Question 2 "Independent assortment" refers to assortment of sister chromosomes at the metaphase plate in meiosis I assortment of sister chromatids at the metaphase plate in meiosis I assortment of sister chromatids at the metaphase plate in meiosis II assortment of homologous chromosomes at the metaphase plate in meiosis II assortment of homologous chromosomes at the metaphase plate in meiosis I A assortment of sister chromosomes at the metaphase plate in meiosis IIQUESTION 34 What would be predicted to be the most common cause of chromosome translocations in Meiosis? A. Incorrect resolution of chiasmata in Meiosis II B. single point mutations during Meiosis II C. nondisjunction events resulting from incorrect resolution of chiasmata in Meiosis I D. improper cleavage of the cohesion complexQUESTION 6 Assume that a researcher is studying coat color in voles. Three strains of white vole have been isolated: milky, blanc, and weiss. White is a recessive trait in each strain. Homozygous white voles are obtained for each strain. Consider the following crosses: milky X weiss = all white progeny (mutant) milky X blanc = all brown (wild-type vole color) blanc X weiss = all brown (wild-type vole color) The conclusion most consistent with these results is O A all three strains have mutations in the same gene. O B. all three strains have mutations in different genes. OC. milky and blanc have mutations on the same gene, weiss has a mutation in a different gene. D. milky and weiss have mutations on the same gene, blanc has a mutation in a different gene. O E. weiss and blanc have mutations on the same gene, milky has a mutation in a different gene.
- QUESTION 8 Match the stage of meiosis to its description. Watch for "cell" versus "cells". Singular versus plural is a clue that will help you pick the right roman numeral. homologous chromosomes line up next to each other as tetrads along the mid- line of the cell DNA condenses, tetrads form as homologous chromosomes come together and exchange DNA parts in crossing over, nuclear membrane disintegrates A. Early Interphase B. Late Interphase one of each homologous pair reaches the end of the cell, new nuclear membranes form, and the cell membrane begins to pinch in C. Prophase I v DNA condenses in two cells, nuclear membranes disintegrate D. Metaphase I the copies of the chromosomes (daughter chromosomes formerly known as sister chromatids) split apart and move towards the ends of two cells E. Anaphase I v the cell divides into two cells, chromosomes decondense F. Telophase I G. Interkinesis tetrads separate and homologous chromosomes begin to move in opposite directions in a cell H.…QUESTION 19 What chromosomes belong to a normal human male? O 22 autosomes and two Y chromosomes 44 autosomes and two Y chromosomes 44 autosomes, one X chromosome, and one Y chromosome 46 autosomes, one X chromosome, and one Y chromosome QUESTION 20 How many chromosomes will a cell with a diploid number of 40 have in its gametes O 40 O 20 O 5 O 10 Click Save and Submit to save and submit. Click Save All Answers to save all answers.For this question use the following symbols for duplicated chromosomes X, Y, and 1, and draw the chromosomes from a human male as a cell goes through the divisions described below. = X = Y = 1 a. Mitosis, showing (i) the starting cell (after S phase) and (ii) the cell(s) after mitosis. b. Meiosis with a nondisjunction of the Y chromosome in meiosis II, following only those three types of chromosomes: (i) the starting cell (after S phase) and (ii) the celI(s) after meiosis I and (iii) the cell(s) after meiosis II. **label each chromosom