Bellringer The offspring of asexual reproduction are a)Identical to the parent organism b)Similar to a parent organism c)A combination of two parent organisms d)Prokaryotic

Agenda Anticipatory Set Input (notes on genetics) Guided Practice Independent Practice Closing

Objective SWBAT identify the effects of dominant and recessive traits in offspring.

3.6 Genetics Class Notes

Mendel - Mendel discovered that traits are passed or inherited from one generation to the next.

Gene inheritance Organisms inherit one gene for a trait from each parent. As a result, an organism can have two different genes for the same trait.

Let’s Practice 1.Who is Mendel? 2.Can you have two different genes for the same trait?

Some genes are dominant, while others are recessive. “Stronger” traits are called dominant. “Weaker” traits are called recessive.

Let’s Practice 1.What is the difference between dominant and recessive traits?

Geneticists use letters to represent the different forms of a gene. Dominant traits are represented by a capital letter. Yellow seeds are dominant…….. Y

Recessive genes (for the same trait) are represented by THE SAME lower case letter. Green seeds are recessive………. y Dominant (yellow) = Y Recessive (green) = y

Let’s Practice… 1.Are dominant traits represented by capital letters or lower case letters? 2.Are recessive traits represented by capital letters or lower case letters?

Let’s Practice… 1.If purple petal color is dominant, will the symbol for purple color be P or p?

In pea plants, tall is dominant over short. The letter used to represent the tall gene is T. The short gene is represented by t. Tall =T Short = t Tall =T Short = t

In humans, brown eyes are dominant over blue. Brown = B Blue = b

Dominant genes hide recessive genes when both are inherited by an organism. Y + y = yellow seeds (yellow is dominant) T + t = tall plant (tall is dominant) B+ b = brown eyes (brown is dominant)

Let’s Practice… 1.If yellow seeds (Y) are dominant and green seeds (y) are recessive, and an organism has one Y gene and one y gene, what color seeds will the organism have?

Q1 If you cross a green cobra with a yellow cobra, and there are 5 green baby cobras and 2 yellow baby cobras, which trait is dominant? a)Yellow color b)Green color c)Yellow and green stripes d)Orange color

Q2 If you cross a big viper with a medium viper, and all the baby vipers are medium size, which trait is recessive?

Q3 If you cross a blue dragon and a red dragon, and you get 3 blue dragons and one red dragon which trait is recessive?

Q4 If one parent has detached earlobes and the other parent has attached earlobes, and all of their children have detached earlobes, which trait is dominant?

Q5 If you cross a blue eyed dog with a brown eyed dog, and all the puppies have brown eyes, which trait is recessive?

Q6 If a short tail is dominant, will the symbol for a short tail be T or t?

Q7 If small ears are recessive, will the symbol for small ears be S or s?

Q8 1.If brown hair (B) is dominant and red hair (b) is recessive, and an organism has one B gene and one b gene, what color hair will the organism have?

3.6 Independent Practice