EBK HUMAN BIOLOGY
11th Edition
ISBN: 8220100545931
Author: MCMILLAN
Publisher: Cengage Learning US
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Chapter 18, Problem 1CT
Normally you can’t inherit both copies of a homologous chromosome from the same parent. Why? Assuming that no crossing over has occurred, how likely is it that one of your non-sex chromosomes is an exact copy of the same chromosome your maternal grandmother had? Explain your answer.
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Chapter 18 Solutions
EBK HUMAN BIOLOGY
Ch. 18 - Prob. 1RQCh. 18 - Prob. 2RQCh. 18 - Prob. 3RQCh. 18 - Name the four main stages of mitosis, and describe...Ch. 18 - Prob. 5RQCh. 18 - Prob. 6RQCh. 18 - Prob. 1SQCh. 18 - Prob. 2SQCh. 18 - Prob. 3SQCh. 18 - Prob. 4SQ
Ch. 18 - Prob. 5SQCh. 18 - After mitosis, each daughter cell contains genetic...Ch. 18 - All of the following are stages of mitosis except...Ch. 18 - Prob. 8SQCh. 18 - Prob. 9SQCh. 18 - Because of the ________ alignment of homologous...Ch. 18 - Match the stage of mitosis with the following key...Ch. 18 - Normally you cant inherit both copies of a...Ch. 18 - Suppose you have a way of measuring the amount of...Ch. 18 - Adams maternal and paternal chromosomes have...Ch. 18 - Fresh out of college, Maria has her first job...
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- Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele? c. If a female is heterozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele?arrow_forwardAssume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are absolutely identical, at what point during meiosis did the nondisjunction event take place?arrow_forwardA normal mother has translocations on chromosomes 14:21. With respect to chromosomes 14:21, how many combinations of chromosomes are possible? How many gametes are viable? If the woman has children with an normal father, what is the probability that there is a daughter with Down Syndrome or a son with an unaffected phenotype?arrow_forward
- The chromosomes in the illustration below are found in a male betta fish and carry the gene for determining a trait in the tail of the betta fish. In betta fish, single tails are domi- nant to double tails. During meiosis, when gametes are formed, the male fish can only pass on one allele for the tail trait to each gamete. In a male fish that happens to be heterozy- gous, a gamete can only inherit the dominant allele on chromosome 1 or the dominant al- lele on chromosome 2. A An illustration of paired homologous chromosomes. B centromere с D Which of Mendel's laws best explains how the male fish can only pass on one allele to each gamete? paired homologous chromosomes Law of Independent Assortment Law of Segregation Law of Dominance chiasma Law of multiple alleles homologous chromosome 1 homologous chromosome 2arrow_forwardWe say that genes that are close together on the same chromosome are linked. What does that mean? Imagine that in a diploid nucleus, one chromosome has the allele R and right next to it on the same chromosome is the allele T for a different gene. Are these linked? Imagine that r is right next to t on the homologous chromosome. If this cell never undergoes meiosis, does this matter at all? If it does undergo meiosis, what are the two genotypes that the gametes are most likely to have? Look at Figure for help if you need it.arrow_forwardRed–green color blindness is a human X-linked recessive disorder. A young man with a 47,XXY karyotype (Klinefelter syndrome) is color blind. His 46,XY brother is also color blind. Both parents have normal color vision. Where did the nondisjunction that gave rise to the young man with Klinefelter syndrome take place? Assume that no crossing over took place in prophase I of meiosis.arrow_forward
- Two genes, A and B, are 10 map units apart along the same chromosome. A cross was made between AAbb and aaBB individuals to produce AaBb F1 offspring. The F1 offspring were then crossed to aabb individuals to yield an F2 generation. What would be the genotype(s) of F2 offspring that carry recombinant chromosomes? (Note: recombinant chromosomes are the product of crossing over). What percentage of F2 offspring would be Aabb?arrow_forwardThe inactivation of one of the X chromosomes forms a structure known as a(n): telomere centromere autosome Barr body A man who carries a dominant X-linked trait will pass this trait on to: all of his sons all of his daughters half of his daughters and half of his sons half of his daughters An individual possessing two copies of the same sex chromosomes is known as: Question 3 options: heterogametic homozygous diploid homogameticarrow_forwardIn a sample of 1000 patients with Down syndrome, a geneticist discovers that 95% of them are trisomic, while 5% have diploid number of chromosomes. Explain this discrepancy.arrow_forward
- On average, what fraction of the genome in the pairs of humans would be exactly the same if no crossing over took place? For the purposes of this question only, ignore the special case of the X and Y sex chromosomes and assume that all genes are located on nonsex chromosomes. Also, assume that the uncle and niece are related by a sibling and not by marriage alone. Father and Child: Mother and Child: Full-Siblings: Half-Siblings: Uncle and Neice: Grandparent and Grandchild: Answer Bank: 1/2, 0, 1, 1/4, 3/4arrow_forwardIn general, why do changes in chromosome structure or numbertend to affect an individual’s phenotype? Explain why somechanges in chromosome structure, such as reciprocal translocations,do not.arrow_forwardAssume that color blindness is a recessive character on the X chromosome. A man and woman with normal vision have the following offspring: a daughter with normal vision who has one color-blind son and one normal son; a daughter with normal vision who has six normal sons; and a color-blind son who has a daughter with normal vision. What are the probable genotypes of all individuals?arrow_forward
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