Presentation is loading. Please wait.

Presentation is loading. Please wait.

DO NOW (Just write answers)  What is incomplete dominance  Define recessive  Where does the variation in gametes arise from in meiosis  What is the.

Similar presentations


Presentation on theme: "DO NOW (Just write answers)  What is incomplete dominance  Define recessive  Where does the variation in gametes arise from in meiosis  What is the."— Presentation transcript:

1

2 DO NOW (Just write answers)  What is incomplete dominance  Define recessive  Where does the variation in gametes arise from in meiosis  What is the purpose of meiosis  What is mitosis  What is an allele  What does homozygous and heterozygous mean

3

4 THIS TERM Week 1: GENETICS Week 2: GENETICS Week 3: GENETICS Week 4: ANIMALS Week 5: EXAM WEEK Week 6: ANIMALS Week 7:ANIMALS Week 8: PLANTS Week 9: FIELD TRIP Week 10: PLANTS

5 THIS TERM  HOMEWORK – BIOZONE AND EXAM QUESTIONS (past test results)  IN CLASS WORK ETHIC  HELP: WED LUNCHTIMES

6 REVIEW – USE WHITE BOARDS  Write the combinations for gametes for the following crosses  HhBB x HHBb  PpHh x ppHh  RrFf x rrFF

7 TO DO ON BOARDS  In summer squash, white fruit colour (W) is dominant over yellow fruit colour (w) and disk-shaped fruit (D) is dominant over sphere-shaped fruit (d)  If a heterozygous white coloured sphere shaped squash was crossed with a yellow coloured homozygous disk shaped squash what would the phenotype ratio of their offspring be? IF FINISHED GRAB WORKSHEET FROM FRONT

8 EXAM QUESTION 2004  In horses, black coat colour is influenced by the dominant allele (B) and chestnut coat colour by the recessive allele ( b). Trotting gait is due to dominant gene (T), pacing gait to the recessive allele (t).  A horse trainer wanted to find the genotype of a black trotter she bought.. a) Give the genotype and phenotype of the horse she would use to find out the genotype of a black trotter. Explain your answer b) Use a punnett square to work out the phenotypic ratio of all possible offspring when a black male heterozygous for both traits is mated with a female heterozygous for both traits. c) Explain why, when breeding chestnuts together she would not get any black foals, but when breeding black horse she could get chestnut foals

9 SEX LINKAGE  This occurs when genes are located on the sex chromosomes either the X or the Y chromosome (note: autosomes are the other chromosomes)  Example: Colour blindnessColour blindness  Sex linked gene located on the X chromosome  N = normaln = colour blind  X N = normal visionX n = colourblind  Y = male

10 PROBLEM:  Can a woman with normal vision whose father was colour blind have colour blind children if she marries a normal visioned male?  Genotypes?  Do a cross?  Continue with extra questions


Download ppt "DO NOW (Just write answers)  What is incomplete dominance  Define recessive  Where does the variation in gametes arise from in meiosis  What is the."

Similar presentations


Ads by Google