What biological mechanism allows humans with an XXX genotype to be healthy individuals?

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 statements is TRUE? Overexpression of the X-chromosome in the somatic cells of males a. leads to the formation of a Barr body in male cells' nuclei. b. leads to cellular mosaicism in males hemizygous for an X-linked gene. c. is characteristic of all XY systems of sex determination. d. is the mechanism in flies to compensate for the higher dosage of X-linked genes in females as compared to males. e. None of the above

Answer the following series of questions based on this karyotype obtained from a newly discovered plant species. 6 7 10 11 12 自 0 13 14 15 16 17 18 19 20 21 22 а. What is the ploidy of the genome shown in the karyotype? b. How many chromosomes are shown in this karyotype? c. How many sister chromatids are shown in the content shown in the circle? d. Given a particular locus, provide one representation of a genotype for a heterozygote e. How many different alleles for a given gene can this plant species carry? f. What is the haploid number if a somatic cell has this karyotype? 摩

In marsupials, X inactivation occurs exclusively to paternally derived chromosomes. Which genes will ALWAYS be expressed in this situation? A. maternal X-linked genes B. paternal X-linked genes C. maternal Y-linked genes D. paternal Y-linked genes

Which of the following statements are true regarding homologous pairs of chromosomes? Select all that apply. A. They are the same size B. Their prescence indicates a cell is a diploid C. They are identical copies of one another D. One of the homologous chromosomes in a set is synthesized during S phase E. They line up next to each other during metaphase I of meiosis F. They are separated in anaphase I of meiosis