Chromosome terms Study the image below, then click on all of the true statements. These homologous chromosomes have different alleles. Sister chromatids always have the same alleles. Gene A is at the same locus on all four chromatids. Allele A has two genes. A A a a

Alternative versions of a gene on homologous chromosomes are called ____________. Abnormal cell division genetically gone wrong is called _________________. In meiosis, one  germ cell produces how many gametes?  In meiosis, new sex cells have a ________________ number of parental chromosomes? During  meiosis, a process called ____________________ can produce increased  genetic  variation in the new gametes due to the close contact between sister chromatids of homologous chromosomes.

Consider three genes: X, Y, and Z. The X and Y genes are on the same chromosome; gene Y is on a different chromosome. An organism is heterozygous for all three genes. The cell’s parents were both homozygous for all three genes. This organism produces a gamete with the dominant X allele. Which of the following is true of this gamete? A. It is likely to have both the dominant Y and Z alleles. B. It is likely to also have the dominant Y allele but not necessarily the dominant Z allele. C. It is likely to also have the dominant Z allele but not necessarily the dominant Y allele. D. It is not more likely to have either the dominant Y or dominant Z alleles.