A population is undergoing evolution by natural selection for a trait. What determines whether an allele will become more common in the population?

Max visited the Wild Things (pictured above). In Wild Things, XX individuals produce eggs and are female; XY individuals produce sperm and are male. Several traits in Wild Things are genetically based. the length of horns is genetically based: HH and Hh = curved horns, hh = straight horns having claws on the feet is determine by an X-linked gene. XB is dominant and results in absence of claws; Xb is recessive and results in claws. A female who is heterozygous for both traits and a male without claws who is heterozygous for horns have offspring. Answer the following questions based on this couple. You should start by determining their genotypes and setting up the Punnett squares. The probability that their first offspring would have curved horns is . The probability of their first child having straight horns and NO claws is . The probability of their first child being a female with claws is . Each parent only passes on one of the two alleles they have (Mendel’s Law of Segregation), and the way that the alleles for horns is passed on does not impact the way the allele for claws is passed on (Mendel’s Law of Independent Assortment). These two laws are the result of the way that works.

What is necessary in order for a cell to move ions against their concentration gradient and establish a high concentration of ions on one side of a membrane?

Choose the mechanism of evolution that best matches the description given.

When two atoms form a chemical bond, one takes an electron from the other. The two atoms then have full, opposite charges and and attracted to each other. This is an example of what type of bond?

Which of the following events occurs earliest in mitosis?

What is true of linked genes? Choose all correct answers.

There are both similarities and differences in cellular respiration and photosynthesis. Summarize some of them by choosing the correct answers from the drop-down boxes. The initial energy input that starts glycolysis and is used to drive cellular respiration is . The initial energy input used to drive photosynthesis is . Both cellular respiration and photosynthesis involve electron transport chains (e.t.c.) in a membrane. The e.t.c. involved in cellular respiration is found in the ; the e.t.c involved in photosynthesis is found in the . The immediate source of energy for the e.t.c. in cellular respiration is ; in photosynthesis, it is . In cellular respiration, the e.t.c. is used to directly generate ; in photosynthesis, the e.t.c from PS II is used to directly generate , and the e.t.c from PS I is used to directly generate .

A point mutation changes a codon from 5′ UGG 3′ to 5′ UGU 3′. This changes the amino acid from tryptophan (which is nonpolar) to cysteine (which is polar). What is the most likely impact of this mutation on the protein’s structure and function?

What are things you need to be careful about when you are hanging up a work phone call?