Which of the following statements about homologous chromosomes is correct?a. Each gene is at the same locus on both chromosomes.
b. They are two identical copies of a parent chromosome which are attached to one another at the centromere.
c. They always produce identical phenotypes.
d. They are chromosomes that have identical genes and alleles.

The amino acid in figure one is found in a region of a polypeptide that folds away from water which part of the amino acid and most likely contributes to the hydrophobic behavior of this region of the polypeptide

When adult amphibian skin harbors populations of the bacterium, Janthinobacterium lividum (Jl), chytrid infection seems to be inhibited. Which of the following represents the best experimental design to test whether this inhibition is real?A) Inoculate uninfected amphibians with Jl, and determine whether the amphibians continue to remain uninfected by chytrids.
B) Inoculate infected amphibians with Jl, and determine whether the amphibians recover from infection by chytrids.
C) Take infected amphibians and assign them to two populations. Leave one population alone; inoculate the other with Jl. Measure the rate at which infection proceeds in both populations.
D) Take infected amphibians and assign them to two populations. Inoculate one population with a high dose of Jl; inoculate the other with a low dose of Jl. Measure the survival frequency in both populations.

Each box of information below describes one part of an experiment. Read the information, then write which stage of scientific methodology is beingdescribed.
Word Bank:
Initial observation, hypothesis, experiment, observation and analysis of data, Interpretation, final hypothesis supported.
1. The researchers sampled all the plots throughout the growing season. They measured growth rates, and they analyzed the chemical composition of living leaves.
2.The researchers inferred that something limits grass growth in some places. It could be any environmental factor- temperature, sunlight, water or nutrients. Based on their knowledge of salt marshes, they proposed an idea: Marsh grass growth is limited by available nitrogen.
3. Data analysis confirmed that marsh grasses in experimental plots with additional nitrogen grew taller and larger than the controls.
4. Researchers observed that marsh grass grows taller in some places than in others. This observation led to a question: Why do marsh grasses grow to different heights in different places?
5. The researchers selected similar plots of marsh grass. All plots had similar plant density, soil type, input of fresh water, and height above average tide level. The plots were divided into control and experimental groups.
6. The researchers complied all of the data. They compared the average growth rate in each plot and the average height of the plants.

Predict the offspring of two white homozygous cats. Black is dominant to white. Use B for dominant and b for recessive. what are the genotypes and phenotypes of the new generation? what are the percentages of round and wrinkled plants?

Which of the following calculations require that you utilize the addition rule? A) Calculate the probability of black offspring from the cross AaBb × AaBb, when B is the symbol for black.
B) Calculate the probability of children with both cystic fibrosis and polydactyly when parents are each heterozygous for both genes.
C) Calculate the probability of each of four children having cystic fibrosis if the parents are both heterozygous.
D) Calculate the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both.
E) Calculate the probability of purple flower color in a plot of 50 plants seeded from a self-fertilizing heterozygous parent plant.

True or false Mammals use trees for both food and shelter.