This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. a phylogenetic tree containing two main branches for evolutionary relationships among the animals. the first branch leads to drosophila. the second branch divides into two branches, 2a and 2b. branch 2a leads to lancelet. branch 2b divides into two branches: 3a and 3b. branch 3a leads to zebrafish. branch 3b divides into two branches: 4a and 4b. branch 4a leads to frog. branch 4b divides into two branches: 5a and 5b. branch 5a leads to chicken. branch 5b divides into two branches leading to human and mouse, respectively. this phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. select the correct statement.
(a)-a frog is the ancestor of both a mouse and a chicken.
(b)-the common ancestor of a human and a frog and the common ancestor of a mouse and a chicken lived at the same time.
(c)-the nucleotide sequence of this gene in a mouse is more similar to the sequence in a chicken, and both are less similar to the nucleotide sequence of this gene in a frog.

The image shows ekgs of a person with normal heart waves and of a person having tachycardia. based on this image, what kind of condition is tachycardia? a. the heart beats abnormally fast. b. the heart beats abnormally slow. c. the right atrium of the heart stops working. d. the left ventricle pumps less blood to the aorta.

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

Chapter 11.1 & 11.2 notes section 11.1 1. every living thing has a set of ? inherited from its parents. 2. after becoming a ? , mendel spent several years studying ? and mathematics at the university of vienna. 3. during sexual reproduction, male and female reproductive cells join, a process known as ? . 4. pea flowers are normally ? , which means that sperm cells in pollen fertilize the egg cells in the ? flowers. 5. when mendel crossed plants with ? characters for the same trait, the resulting offspring had only one of the characters. 6. a ? is a specific characteristic, such as seed color or plant height, that varies from one individual to another. 7. filius and filia are the latin words for ? and ? . 8. the offspring of crosses between parents with different traits are called ? . 9.to mendel's surprise, all of the offspring had the character of only ? of the parents. 10. mendel's first conclusion was that biological inheritance is determined by ? that are ? from one generation to the next. 11. scientist calls the chemical factors that determine traits ? . 12. mendel's second conclusion is the ? . 13. the principle of dominance states that some alleles are ? and others are ? . 14. when mendel allowed the f1 plants to reproduce by self-pollination the traits controlled by ? alleles reappeared in about ? of the f2 plants in each cross.