Which statement is the best contemporary expression of Mendel's Law of Segregation? All chromosomes segregate independently of each other. Each pair of alleles separates independently of other pairs during the formation of sex cells. The segregation of one allele dictates the segregation of the other. Each member of a pair of alleles are separated during the formation of sex cells.

Which statement is the best contemporary expression of Mendel's Law of Segregation? All chromosomes segregate independently of each other. Each pair of alleles separates independently of other pairs during the formation of sex cells. The segregation of one allele dictates the segregation of the other. Each member of a pair of alleles are separated during the formation of sex cells.

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter14: Chromosomes And Human Inheritance

Section: Chapter Questions

Problem 3GP: Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With...

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The gene for the production of eye colour in this species of fruit fly can be expressed aseither normal red-eyes or as brown-eyes. The allele for the normal red eyes is dominant tothat of brown, and is transmitted in normal Mendelian fashion.A gene involved with body colour in this species of fruit fly is located on the non-homologousportion of the X chromosome, and has two alleles, grey and yellow, where the grey allele isdominant to yellow.The two genes are NOT linked.a) Produce a key to clearly show the nature of the alleles associated with the eye colour inthis species of Drosophila, and in each case justify your choice of letters and / or style ofpresentation to best depict the genetics involved.
In organisms with the ZZ-ZW sex-determining system, from which of the following possibilities can a female inherit her Z chromosome? Yes No Her mother's mother Her mother's father Her father's mother Her father's father
The other difference in alleles stems from the fact that our 23rd chromosome pair is unique. This pair isreferred to as our sex determining chromosome. Your sex is a condition partially determined by whetheryou have two Xs (XX individuals are typically biologically female) or an X and a Y (XY individuals aretypically biologically male). We don’t use the terms woman and man in here because those aresociological archetypes and although some of those traits are related to your chromosomes, they aren’tdefined by them.Again, the X from the XY parent is in bold so you can see that XX offspring get 1 X from their XY parentand 1 X from their XX parent. XY offspring get an X from their XX parent and a Y from their XY parent. What chromosome does a XY parent give to a XY offspring?
Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele? c. If a female is heterozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele?
Explain what nondisjunction is, and give two examples of phenotypes that can result from it.
In 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 father
in the experiment of following chromosomal dna mvement througgh meiosis, why. do you use non-sister chromatids to demobstrate crossing over? what combinatiobns of alleles could result from a crossover between BD and bd chromosomes? Identify two ways that meiosis contributes to genetic recombination. Why is it necessary to reduce the number of chromosomes in gametes, but not in other cell?
Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one (extra) chromosome 21. While there is reduced fertility in both sexes, females have higher fertility than males. Van Dyke et al. (1995; Down Syndrome Research and Practice 3(2):65—69) summarize data involving children born of Down syndrome individuals. Given the fact that conceptuses with 48 chromosomes (four #21 chromosomes) are not likely to survive early development, what percentage of surviving offspring would be expected to have Down syndrome if both parents have Down syndrome All the children would be expected to have Down syndrome. One-third of the surviving offspring would be expected to have Down syndrome. Two-thirds of the surviving offspring would be expected to have Down syndrome. One-half of the surviving offspring would be expected to have Down syndrome.
Mendel's laws of segregation and independent assortment are based on the movement of chromosomes during meiosis, even though Mendel did not know about chromosomes during his lifetime. Can you match each of the following events with the law it illustrates? Sort each event to the appropriate bin. If an event doesn't illustrate either law, drag it to the neither bin. Reset H
Which statement about the relationship between genetic map and physical map is FALSE? The correlation between Genetic map distance and Physical map distance is not absolute. Roughly speaking, for two genes on the same chromosome, the bigger their genetic map distance is, the bigger the physical map distance is. The genetic map is in a way a distorted picture of the physical map. 1 genetic map unit (1cM) always correlates with a certain distance on the physical chromosome.
Blank are chromosomes with the same genes but potentially different alleles while blank are exact copies of each other containing the same genes and same alleles
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 2