Down syndrome occurs when an individual has a mutation of chromosome 21. In what organelle does this mutation occur? A)cell wall B)genes C)mitochondria D)Nucleus

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is

Refer to the family pedigree shown here. in generation i, one parent is affected by the gene mutation and one parent isn't. in generation ii, all three children are affected by the gene mutation. what can you conclude about this gene mutation? a. all children born in future generations will be affected by this disorder. b. this gene mutation is a dominant disorder. c. this gene mutation is a recessive disorder. d. the generation i mother is a carrier of this gene mutation.