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5.4 Inheritance

5.4 Inheritance
TB Page 132
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Slide 1: Slide
Biologie9th Grade

This lesson contains 65 slides, with interactive quizzes, text slides and 2 videos.

time-iconLesson duration is: 45 min

Items in this lesson

5.4 Inheritance
TB Page 132

Slide 1 - Slide

What is Inheritance?


Slide 2 - Slide

Inheritance is the process by which genetic information is passed on from parent to child. This is why members of the same family tend to have similar characteristics.


Slide 3 - Slide

Homologous (matching) pairs

Slide 4 - Slide

Slide 5 - Slide

Homologous pair of chromosomes

Slide 6 - Slide

Homologous pair of chromosomes

Slide 7 - Slide

Slide 8 - Slide

Workbook Page 143
Questions 16 till 19
timer
6:00

Slide 9 - Slide

DOMINANT
recessive

Slide 10 - Slide

Slide 11 - Slide

Slide 12 - Slide

Slide 13 - Slide

Slide 14 - Slide

Slide 15 - Slide

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Slide 18 - Slide

Yolanthe & 
Wesley
Other couple

Slide 19 - Slide

Workbook Page 143
Question 20
timer
5:00

Slide 20 - Slide

Darwin                                                               Mendel

Slide 21 - Slide

3

Slide 22 - Video

Terms in genetic crosses
  • P = Parental = the parents
  • F1 = first new generation of offspring = the children
  • F2 = 2nd generation = the grandchildren

Slide 23 - Slide

02:28
Look at Table 5.2 on page 134.
Which flower colour is dominant?

Slide 24 - Open question

02:38
Again: Table 5.2 on page 134.
Which stem length is recessive?

Slide 25 - Open question

03:51
What does 'F1 generation' mean?

Slide 26 - Open question

2

Slide 27 - Video

Homozygous, Heterozygous
An organism has two identical alleles of a gene:
Homozygous : AA  or  aa         /        RR  or  rr    etc. (Homo = 'same')
  • homozygous dominant: AA   
  • homozygous recessive: aa

An organism has two different alleles of a gene:
Heterozygous: Aa                  /           Rr         etc. (Hetero = 'different')

Slide 28 - Slide

Phenotypes versus genotypes!
Phenotype: purple 

Genotype?

Slide 29 - Slide

Phenotypes versus genotypes!
Phenotype: white

Genotype?

Slide 30 - Slide

Genetic crosses: white x white
x
F 1

Slide 31 - Slide

Genetic crosses: purple x purple
x
F 1

Slide 32 - Slide

Genetic crosses: purple x purple
x
F 1

Slide 33 - Slide

Workbook Page 144
Questions 21 and 22
timer
1:00

Slide 34 - Slide

Two types of crosses
Homozygous : AA x aa         /        RR x rr  etc. (Homo = 'same')



Heterozygous: Aa x Aa       /        Rr x Rr  etc. (Hetero = 'different')


Slide 35 - Slide

Two types of crosses
Homozygous : AA x aa         /        RR x rr  etc. (Homo = 'same')

Gametes: A and A  ,  a and a    /    R and R  ,  r and r

Heterozygous: Aa x Aa       /        Rr x Rr  etc. (Hetero = 'different')

Gametes: A and a , A and a    /      R and r , R and r

Slide 36 - Slide

TB page 136
Steps for succesfully solving genetics problems

Slide 37 - Slide

04:41
The F1 consists of all purple flowers even though 1 parent is white. Why?

Slide 38 - Open question

05:08
What is the term for a characteristic that is present but not (yet) expressed?
A
dominant
B
recessive

Slide 39 - Quiz

Slide 40 - Slide

Slide 41 - Slide

Slide 42 - Slide

Ss: Homozygous or heterozygous for the Spot allele?
A
Homozygous
B
Heterozygous

Slide 43 - Quiz

Slide 44 - Slide

Cat without Spots?
A
SS
B
Ss
C
ss

Slide 45 - Quiz

Slide 46 - Slide

Spotty cat coud be Ss and...
A
SS
B
Ss
C
ss

Slide 47 - Quiz

Slide 48 - Slide

Answers:

Slide 49 - Open question

Today:
  • Quick quiz
  • Homework check
  • Practice

Slide 50 - Slide

An exampe of a heterozygous genotype is...
A
BB
B
Bb
C
bb

Slide 51 - Quiz

When you cross BB x bb, the offspring will be
A
100% BB
B
100% Bb
C
50% Bb and 50% bb
D
25% BB, 50% Bb, 25% bb

Slide 52 - Quiz

When you cross Bb x bb, the offspring will be
A
100% BB
B
100% Bb
C
50% Bb and 50% bb
D
25% BB, 50% Bb, 25% bb

Slide 53 - Quiz

When you cross Bb x Bb, the offspring will be
A
100% BB
B
100% Bb
C
50% Bb and 50% bb
D
25% BB, 50% Bb, 25% bb

Slide 54 - Quiz

Slide 55 - Slide

timer
1:00

Slide 56 - Slide

Answers:

Slide 57 - Open question

Slide 58 - Slide

Textbook page 150
  1. Question 27 - together
  2. then...
  3. Practice question - by yourself

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