Biology

Quiz on Monday

EAL Biology Quiz

On Monday you will have a quiz about the following points:

· Meiosis- including all of the stages, you should be able to recognize and identify the different stages involved. Look at the homework you did where you identified and wrote about the different stages

· Genetic Crosses- You should be able to correctly set out genetic cross diagrams in the way that I showed you, using all of the appropriate terms and labels

· Determination of sex- A simple cross to illustrate this and how the male determines the sex of a child

· Genetic linked disorders- be able to show this with genetic crosses and understand how you have carriers for diseases that are coded for by recessive genes

· Blood Groups- The ABO system. You should be able to show all the possible blood groups and understand that this is coded for by three alleles and A and B show co-dominance

· Sex linked genetic disorders- You need to be able to show a cross for a diseases such as hemophilia, where the male only has one gene and either has the disease or not. You need to understand and be able to explain why this is so

· Understand IVF and genetic screening

The following are some brief definitions of some of the terms. Please also look in your book, where it has the definitions in square boxes.

· DNA- Chromosomes contain long strands of DNA. The DNA contains the codes that instructs which proteins are made

· Gene -length of DNA that codes for a particular protein (characteristic)

· Allele- Two or more forms of a gene

· Meiosis- Reduction division where the chromosome number is halved. Sex cells are made this way

· Haploid nucleus- a nucleus containing a single set of unpaired chromosomes (e.g. sperm and eggs)

· Phenotype- Physical or other features of a gene

· Genotype- Genetic makeup of an organism

· Dominant gene- The allele that is expressed if present

· Recessive gene- An allele that is only expressed if there are two recessive genes present

· Co-dominant- Where neither is completely dominant or recessive, so both influence the phenotype

· Homozygous- Having two identical alleles of a particular gene

· Heterozygous- Having two different alleles of a particular gene

- Genetic Terms
Genotype is the genetic composition of an organism. Phenotype is the set of characteristic manifested by an organism. An individual has a heterozygous condition if he has 2 different alleles of the same gene An individual has a homozygous condition if...

- A Locus May Have Many Different Mutant Alleles
KEY TERMS:A locus is said to have multiple alleles when more than two allelic forms have been found. Each allele may cause a different phenotype. KEY CONCEPTS: The existence of multiple alleles allows heterozygotes to occur representing any pairwise...

- A Gene Codes For A Single Polypeptide
KEY TERMS:A homomultimer is a protein composed of identical subunits. A heteromultimer is a protein that is composed of nonidentical subunits (coded by different genes). KEY CONCEPTS: The one gene : one enzyme hypothesis summarizes the basis of modern...

- Homework- Gas Exchange
After watching the video clip (under lung structure post) on gas exchange in the lungs, write a detailed account of how gas exchange occurs. You need to include terms such as: surface area, diffusion, alveoli, capillary network etc You should of course...

- Notes On Reproduction
Some key points about mitosis and meiosis.Mitosis· Mitosis is where diploid cells produce more diploid cells. This is how all the cells are reproduced, except, the gametes ( sex cells) · ...

Biology