WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
5th Edition
ISBN: 9781319516116
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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Chapter 8 Solutions
WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
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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_forwardWhich of the following could explain how might a human having the XX sex chromosomes can develop as a male? Both of his X chromosomes become inactivated giving rinse to a male. The autosomal Sox9 gene is inactivated in the male. This is not possible. His father suffered a chromosomal translocation in the reproductive cells that moved the SRY region to the X chromosome. The ratio of X chromosomes to haploid sets of chromosomes has been altered.arrow_forward
- The 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_forwardIn 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_forwardWhich 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_forward
- Which 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_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_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_forward
- An 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_forwardOne reason that worker bees forgo their own reproduction to help their sister (the queen) reproduce is that female bees are more closely related to their sisters than they are to their own offspring. This quirk of genetics results from the fact that bees have haplodiploid sex determination, in which females are diploid, with a mother and a father, but males are haploid, developing from unfertilized eggs. Because males are haploid, they produce sperm by mitosis. Explainwhy haplodiploid sex determination causes females to be more closely related to their sisters than to their offspring.arrow_forwardThe picture below represents a G1 cell from a newly discovered species that uses the X/Y sex determination system. Alleles for the different autosomal genes of interest are indicated on the chromosomes, and genes R and T are 36 cM apart. Red lines show maternal chromosomes, and blue lines show paternal chromosomes. Answer the following questions about this individual. g|G a) This individual can produce a pool of different gametes. List any TWO potential gametes that will occur at different frequencies. Give the alleles of each gamete contained within a set of brackets, and indicate the expected frequency (up to two decimals) at which that gamete would occur. b) Name any two loci in this individual that can result in recombination in the gametes via the process of independent assortment. c) What is the sex of this individual? Justify your answer. d) Give the term that will describe the morphology of the chromosome that carries the R/T alleles. e) Provide the genotype of the fertilizing…arrow_forward
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