Which of the following statements regarding the Y chromosome in mammals is TRUE? A. The Y chromosome is less than half the size of the X chromosome. B.Y chromosomes are most often present in egg cells and are not found in sperm cells. C.Most female mammals have one Y chromosome. D. The Y chromosome contains no protein-coding genes.

Explain in detail how does Swyer syndrome occur? (a person who is typically raised as female and has female external genitalia but also has a Y chromosome).  It has been noticed in the 2016 Olympics, as it was hotly debated.

STUDY GUIDE Name a A HUMAN TRAITS In your textbook, read about color blindness in Section 27:2. 1. Color blindness is a trait carried on the sex chromosomes. Let C be normal color vision and c b red-green color blindness. Use the diagrams to answer the questions. a. What is the sex of each of these people? Write either male or female on the blank below each. XX XX X Xa XX C b. Which are red-green color blind? c. Which have normal color vision? X X XXXXX B ①① X X XXXXX M a XaXa Date a d. Which has normal color vision even with the gene for color blindness? 2. a. Complete the following Punnett squares. The first one has been done for you. b. Using these colors, shade the following parts of the Punnett squares. Blue-normal females Yellow-normal males Red-color blind females Green-color blind males X X XXXXX Class D CHAPTER 27 X X XXXXX a Xalo E X X X×××× X oooolgolma 8 X X XXXXX a X a Xa 15 1

4) Explain why you can NOT typically have a Male Calico cat. 5) Can you think of any unusual situation where you might be able to have a Male Calico cat? Explain how this might occur 6) Explain how X chromosome inactivation takes place in mammals at the chromosomal and molecular level.    B. What genes are involved in inactivating a human X chromosome?  C. What role does  X chromosome-specific inactivating transcript --XIST-- non coding RNA play in the inactivation of the human X chromosome.

Possible options:  A. Autopolyploidy B. Allopolyploidy C. Chromosome duplication D. Pericentric inversion

Which of the following statements about calico cats is true? Select all that apply.

Which of the following is a FALSE statement? A) An individual with two X chromosomes and one Y chromosome has testes. B. The human female determines the sex of her offspring. (C) Genomic imprinting allows for differential expressions of an allele. D. Epigenetic changes can be passed on to a zygote. Deletion of the SRY gene would cause male fetuses to develop as females.

Which of the following is a correct statement regarding mitosis and meiosis? A.)mitosis involves the generation of haploid cells B.)meiosis is used primarily for asexual reproduction C.)chromosomes are duplicated before mitosis but not meiosis D.)meiosis involves two sequential nuclear divisions

Color blindness in humans is an X-linked recessive trait. This means that... O a. Females are more likely to be color blind than males b. The gene associated with color blindness is found on the X chromosome, and an individual must have one (in males) or two (in females) mutant copies of the allele in order to be diagnosed as being color blind