WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
5th Edition
ISBN: 9781319272531
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 8, Problem 10MC
Summary Introduction
Introduction: Sex determination is a procedure that allows an individual to know the sex of newborn offspring, before the actual birth of offspring.
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Mitosis happens throughout the male life cycle however, meiosis takes place only for a limited period of his life cycle. Select one:
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During meiosis in male mammals, sex chromosomes segregate to produce two types of sperm: X‑bearing sperm and Y‑bearing sperm.
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Which of the following statements is correct regarding the human X chromosomes?
It is the same size as other chromosomes and has the same number of genes.
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It is referred to as an autosome.
Chapter 8 Solutions
WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
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- Which of the following statements is not true in comparing mitosis and meiosis? a. Twice the number of cells are produced in meiosis as in mitosis. b. Meiosis is involved in the production of gametes, unlike mitosis. c. Crossing over occurs in meiosis I but not in meiosis II or mitosis. d. Meiosis and mitosis both produce cells that are genetically identical. e. In both mitosis and meiosis, the parental cell is diploid.arrow_forwardIn mammals, there are two sex chromosomes, X and Y, which behave like homologous chromosomes during meiosis. Normal males have one X chromosome and one Y chromosome, and normal females have two X chromosomes. Males with an extra Y chromosome (XYY) occasionally are found due to inappropriate segregation of the chromosomes (i.e. non-disjunction). Which of the following could give rise to such an XYY male? Answer Yes or No for each situation. nondisjunction in the first meiotic division of spermatogenesis; normal meiosis in the mother nondisjunction in the second meiotic division of spermatogenesis; normal meiosis in the mother nondisjunction in the first meiotic division of oogenesis; normal meiosis in the father nondisjunction in the second meiotic division of oogenesis; normal meiosis in the fatherarrow_forwardButterflies have an X-Y sex-determination system that is different from that of flies or humans. Female butterflies may be either XY or X0, while butterflies with two or more X chromosomes are males. This photograph shows a tiger swallowtail gynandromorph, which is half male (left side) and half female (right side). Given that the first division of the zygote divides the embryo into the future right and left halves of the butterfly, propose a hypothesis that explains how nondisjunction during the first mitosis might have produced this unusual-looking butterfly. Question is also in the picture.arrow_forward
- Arrange the events in chronological order for the physical process of meiotic recombination. Prophase I of meiosis begins. Recombination is complete. Homologous chromosomes pair together. Enzymes break both strands of DNA in one chromosome. The 3' overhang strand of DNA invades the double helix of the homologous chromosome. Enzymes resolve the Holliday junction. The duplexed strand of DNA serves as a primer for synthesis of new DNA. Enzymes degrade the 5' strands of DNA.arrow_forwardThe duck billed platypus is an unusual mammal. If you examine the sex chromosomes of a female platypus you will find a total of 10 X chromosomes. Examining a male platypus finds 5 X chromosomes and 5 Y chromosomes. No other combinations are seen. Each of these five X chromosomes is unique as is each Y chromosome (i.e. X1 pairs only with X1 or Y1, X2 with X2 or Y2 and so on). Why is this unusual? What unusual event must happen during meiosis in a male platypus? (Think carefully about what happens in meiosis 1)arrow_forwardFill in the cells below showing the NORMAL process of meiosis of the male's sex chromosomes (XY – the X and Y are representing the entire chromosome, and remember X and Y act like a homologous pair). DO NOT show crossing over. prior to meiosis 44 +XY What are the possible normal gametes produce after meiosis division? Identify the possible sex of the offspring if these normal sperm cells are fertilized by the egg cell.arrow_forward
- In some insects the female have two x chromosomes, while the males have One x chromosomes and no y chromosome .if the normal deploid number in an insect of this type is 14 what would be the number of chromosomes in the body cells of males and of females?arrow_forwardThe process of meiosis occurs during the cell cycle production and results in four unique diploid four identical diploid cells four unique haploid cells four identical haploid cells . To maintain the correct number of chromosomes in offspring, male and female gametes contain the same number half of the number twice the number of chromosomes as somatic cells. During fertilization, gametes fuse to form a diploid haplid cell called a zygote.arrow_forwardWhich of the following processes results in the independent assortment of chromosomes? the random combinations of eggs and sperm during fertilization the diverse combination of alleles that may be found within any given chromosome the random way each pair of homologous chromosomes lines up at the metaphase plate during meiosis I the random distribution of the sister chromatids to the two daughter cells during anaphase IIarrow_forward
- Which of the statements is FALSE? Somatic cells are diploid in diploid organisms. Gametes are produced from meiosis by germline cells. Somatic cells are capable of both mitosis and meiosis. Somatic cells and gametes from the same organism have different chromosomal complements.arrow_forwardWhich of the following statements is INCORRECT? Synapsis of the X and Y chromosomes in males occurs only at the pseudoautosomal regions. Genes in the pseudoautosomal regions on the Barr body X chromosome escape inactivation. Nonhomologous regions of the X and Y chromosome condense to form a sex vesicle during leptotene. Although one of the two X chromosomes in XXY males becomes a Barr body, XXY males have three doses of the genes in the PAR regions.arrow_forwardAn individual with XY chromosomes produces gametes where 50% have an extra sex chromosome and 50% have no sex chromosomes. Given this information, what is the probability a fertilized egg will have the genotype XO? Assume that the egg has the expected 23 chromosomes prior to fertilization. 1/3 1/2 1/8 1/4 It is not 1/3 or 1/4arrow_forward
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