DO NOW EOC REVIEW PG. 199 4/26/17-WED. COMPLETE THE FOLLOWING: DNA ____ PROTEIN 1. 2. WHAT PROCESS OCCURS AT #1? #2? IF ALL OF YOUR CELLS HAVE THE EXACT SAME DNA, HOW IS IT THAT THEY ARE DIFFERENT? MEANING THEY HAVE A DIFFERENT JOB/FUNCTION. HOW IS THAT POSSIBLE?
Genetics EOC REVIEW DAY 7 4/26/2017
#46 vocabulary dominant – written as a capital letter, this trait will show in Mendelian genetics recessive – written as a lower case letter; only will show if two recessive alleles are present homozygous – SAME alleles; TT or tt heterozygous – DIFFERENT alleles; Tt genotype – letter combination that show the genes; TT, Tt, tt phenotype – physical description; tall or short allele- a gene found at a particular location on a chromosome
#47 In a genetics laboratory, two heterozygous tall plants are crossed. If tall is dominant over short, what are the expected phenotypic results? Tt x Tt T t T t Phenotype: 75% TALL TT, Tt 25 % SHORT tt 3:1 TT Tt tt
R Tt Tt tt tt x Tt t t T t 50% short 50% tall 1:1 If one homozygous short plant is crossed with a heterozygous tall plant, what percentage of the offspring will be short? tt x Tt t t T t 50% short 50% tall 1:1 Tt Tt tt
#48. RRdd x RrDD Rd Rd Rd Rd RD rD
#48 a. Phenotypes: 100% red eyes and dark fur (all have dominant trait) b. Genotypes: RRDd-50% RrDd-50%
#49. Incomplete dominance the two traits blend when both are present RW x RW Two pink flowers are crossed R W R W 25% RED-RR 50% PINK-RW 25% WHITE-WW RR RW WW
#50. Co-Dominance Both traits show up when both are present IA IA IA IB 50% AA IA IA IA IB
50a. Explain how it is possible for a man with type a blood and a woman with type b blood have a child with type o blood. O blood type is recessive, so if the male is AO and the female is BO then one child could have OO
#51 Sex linked traits are carried on the sex chromosome X Males have one X, females have two X’s A male only needs one allele to have the trait, but females need 2 alleles for the trait. This makes is more rare for a female to have a sex linked trait. But females can be carriers.
#52 Sample Sex-linked trait Question: Color blindness is a sex-linked recessive trait. A mother with normal color vision and a color blind father have a color blind daughter. Which of the following statements is correct? All of their daughters will be color blind. The mother is a carrier of the color blindness gene. All of their sons will have normal color vision. All of their sons will be color blind.
meiosis #27. Explain why meiosis is important for sexual reproduction. *Meiosis ensures that the GAMETE (sex) cells are haploid (half chromosome) that way when fertilization occurs (joining of egg & sperm) the correct number of chromosome number is for that species (HUMAN: 23+23=46) #28. What kind of cells are formed from meiosis? *sex cells = GAMETES
2N 1N 2 4 INTERPHASE (S-PHASE) #29 MEIOSIS TYPE OF REPRODUCTION (ASEXUAL OR SEXUAL) SEXUAL CHROMOSOME NUMBER OF PARENT (ORIGINAL) CELL (1N OR 2N) 2N CHROMOSOME NUMBER OF DAUGHTER (NEW) CELLS (1N OR 2N) 1N NUMBER OF CELL DIVISIONS 2 NUMBER OF DAUGHTER CELLS 4 WHEN DOES DNA REPLICATION TAKE PLACE INTERPHASE (S-PHASE)
IPMATPMAT = 2 CELL DIVISIONS (ONLY 1 INTERPHASE) ADD IN! IPMATPMAT = 2 CELL DIVISIONS (ONLY 1 INTERPHASE)