Biology Answers

In north America or south America mammals are they any animals that can survive from fatal falls or hits?

Draw a neat structure of Alanylglycylhistdyllysine

Two students performed the same experiment, testing how far iodine will diffuse through starchy tissue, such as potatoes. They cut 5 potato squares each, all of equal sizes, and placed them into small cups with iodine solution for 15 minutes. Then they measured how far from the edge of the potato the iodine diffused into the potatoes, in millimeters.



⎡⎣⎢⎢⎢⎢⎢Student 1Student 2Distance Diffused (mm)Trial 13.253.14Trial 23.173.43Trial 33.263.22Trial 43.643.37Trial 53.443.28⎤⎦⎥⎥⎥⎥⎥


What is the range of student 1’s results?

A. 3.29
B. 3.35
C. 0.47
D. 0.29

How do extracellular signals work to change the behavior of a cell?

the student is now given sugar solutions with concentrations of 1%,5%,10% and 20%.

Explain how the student could use these solutions to estimate the concentration of sugar in the four fruit juices

. In Drosophila melanogaster, there are dominant alleles for gray-body colour and normal wings. The recessive alleles of these two genes result in black body colour and vestigial wings respectively. Flies homozygous for gray body and normal wings were crossed with flies that had black bodies and vestigial wings. Write down this cross. The F1 progeny were then test-crossed, with the following results:
Gray body, normal wings 236
Black body, vestigial wings 253
Gray body, vestigial wings 50
Black body, normal wings 61

a. Write down the genotype for each phenotype. Would you say that these two genes are linked?
b. If so, how many units apart are they on the chromosome?

3. The cross-over frequency between linked genes A and B is 40%; between B and C, 20%; between C and D, 10%; between C and A, 20%, between D and B, 10%. What is the sequence of the genes on the chromosome?

In the fruit fly Drosophila melanogaster, vestigial wings and hairy body are produced by two recessive alleles located on different chromosomes. The normal alleles, long wings and hairless body, are dominant. Suppose a vestigial-winged hairy male is crossed with a homozygous normal female. What types of progeny would be expected? If the F1 from this cross are permitted to mate randomly among themselves, what progeny would be expected in F2? Show complete genotypes, phenotypes, and ratios for each generation. Make sure to label your alleles, generate a proper Punnett square, include all genotypes and frequencies

With the help of any two examples explain the role of secondary metabolites in taxonomic studies.

Explain and provide examples of polygenic inheritance and pleiotropy?

Explain the hormones and their respective functions during the female menstrual cycle.