Q1: Chimerism in humans is a rare condition in which a person has two (or more) different sets of DNAS. One of the ways a chimera emerge is when there is a fraternal twin, and one of the embryos dies in the earlier stages of pregnancy. The living twin could soak up the other's DNA, leading to chimerism. Which of the following statements is true for fraternal twins? Fraternal twins are the result of a zygote splitting up Fraternal twins could only be same sex Fraternal twins emerge from the same zygote Fraternal twins develop from separate placentas Q2: These nutrients needed by the plants and animals are needed in just small doses. • Zinc Macronutrients Micronutrients • Atmospheric nitrogen

Q1: Chimerism in humans is a rare condition in which a person has two (or more) different sets of DNAS. One of the ways a chimera emerge is when there is a fraternal twin, and one of the embryos dies in the earlier stages of pregnancy. The living twin could soak up the other's DNA, leading to chimerism. Which of the following statements is true for fraternal twins? Fraternal twins are the result of a zygote splitting up Fraternal twins could only be same sex Fraternal twins emerge from the same zygote Fraternal twins develop from separate placentas Q2: These nutrients needed by the plants and animals are needed in just small doses. • Zinc Macronutrients Micronutrients • Atmospheric nitrogen

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter12: Mendel, Genes, And Inheritance

Section: Chapter Questions

Problem 17TYK

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Why are the chromosomes replicating? Why is this necessary for the embryo? (Hint: think about mitosis.)
ACTIVITY 5: Sex-linked inheritance In many animals, the sex of an individual is determined by which sex chromosomes (X or Y) are inherited. In mammals (and the fruit fly Drosophila), females have 2 X chromosomes and males have one X and one Y. The X and Y are an unusual pair of homologous chromosomes. The X is large and contains thousands of genes, while the Y is small and contains few genes. Most genes on the X are not found on the Y, so males possess only one copy of each X-linked gene and females have 2 copies. This means that X-linked recessive traits are expressed more often in males. Eye color is a sex-linked trait in Drosophila. The allele for red eyes is dominant to the allele for white eyes. Because this gene is on the X chromosome, the alleles are written as XR and Xr. A. Do a Punnett square for a cross between a homozygous red-eyed female (XR XR ) and a white-eyed male (Xr Y). What would be the genotypes of the female…
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