produce many diploid cells, the primary spermatocytes. We have presented thus fa
ID: 142339 • Letter: P
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produce many diploid cells, the primary spermatocytes. We have presented thus far two circumstantial tines of Unlike primary oocytes, primary spermatocytes undergo a evidence in support of the chromosome theory of inberi- symmetrical meiosis I. producing two secondary sper tance. First, the phenotype of sexual morphology is as- matocytes, each of which undergoes a symmetrical meio sociated with the inheritance of particular chromosomes sis II. At the conclusion of meiosis, each original primary Second, the events of mitosis, meiosis, and gametogene- spermatocyte thus yields four equivalent haploid spermatids sis ensare a constant number of chromosonves in the so These spermatids then mature by developing a characteristic matic cells of all members of a species over time; one whiplike tail and by concentrating all their chromosomal ma- would expeet the genetic material to exhibit this kind o terial in a head, thereby becoming functional sperm. A human stability even in organisms with very different modes of sperm, much smaller than the ovum it will fertilize, coetains reproduction. Final acceptance of the chromosome the 22 autosomes and either an X or a Y sex chromosome. ory depended on researchers going beyond the circum- he timing of sperm production differs radically from stantial evidence to a rigorous demonstration of two key divisions allowing.con poimts:(1) that the inheritance of genes corresponds w 4 9. In mice, X-1inked DOMINANT allele (G) causes a gray n females but lethal in hemizygous or homozygous co expected in nose in heterozygous nditions. Wha the offspring if the couple has a total 60 baby mice in several gray nose females, 20 normal females, 20 normal males B. 15 gray nose females, 15 normal temales, 15 gray nose males, 15 normal males, . 30 gray nose females, 30 nomal males D. 40 gray nose females, 20 normal males 10True e / False: Sex-limited and sex-influenced traits are different from sex- inked traits in that the latter (sex-linked) trait is caused by the gene that is present in one of the sex chromosomes, but the former (sex-limited & sex-influenced) traits are caused by autosomal genes but still aftected by the individual's sex. 11. Understand and be ready to explain (Don't need to answer this question for this assignment) why the phenotypes of heterozygous females with Duchenne muscular dystrophy (DMD), which is caused by rare X-1inked recessive allele, show non-uniform muscular dystrophy in different parts of their bodies. is inactivated, while in other cells, the other x romosome to inactivate is made at candon early in s. If the X chronosone that is inactivated carries the ANSER: In sone cells a female, onex ch romos ome is inactivated. The decision of whi development, wben the embryo has only wild-type allele, the cel1 would not have the Eunction of the OMD gene because the uo allele on is that carrying the DND mutant allele, then X chromosome with the wild-type allele chromosome is the nonfunctional disease-causing allele. If the cheomosone that is inactivate t the patient, the severity of the sysptons have sormal function of the DMD CHAPTER 5)) Don't need to answer these chapter 5 questions in your assignme nts. It will be still better to solve them for your exam preparation. the map distance between genes A and B is 10 map units and the map distance between genes B and C is 2 between genes A and c? 5 map units, what is the map distanceExplanation / Answer
Q9: B is the correct option as heterozygous for the condition will only be one that will show the dominant expression in case of female and one in case of male; so if total of 60 offsprings are there 15 of each kind will be there.
Q10. True:Sex-limited traits are traits that are visible only within one sex;Sex-linked traits are considered traits for eg; sickle cell anemia and color blindness. Such are said to be linked because more males XY develop these triats than females.Sex-influenced traits are autosomal traits that are influenced by sex. for eg:baldness.
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