chapter 5 (sections 1 & 2) heredity review game. an organism with two dominant alleles or two...

Chapter 5(Sections 1 & 2)

Heredity

Review Game

An organism with two dominant alleles or two recessive alleles is called ______________. (Write both terms)

1

An organism with two dominant alleles or two recessive alleles is called homozygous OR purebred.

1 - Answer

A feature that has different forms in a population is called a ______________.

2

A feature that has different forms in a population is called a characteristic.

2 - Answer

Who is the scientist that studied pea plants to determine how traits are passed from parents to offspring? (First and Last Name)

3

Who is the scientist that studied pea plants to determine how traits are passed from parents to offspring? A: Gregor Mendel

3 - Answer

Draw a punnett square labeled like this:

MaleFemale

4

Fill in your punnett square for the following scenario:

4

A zoo keeper wants to know the chance that a baby giraffe will have a long neck. The mom is heterozygous for a long neck, and the dad is homozygous for a short neck. Use “L” and “l” to represent the alleles.

4

Your punnett square should look like this:Male

Female l

l

l l

Ll Ll

ll ll

4 - Answer

Look at your punnett square. What is the probability that the baby giraffe will be a purebred? Write the genotype(s) of the purebred offspring.

5

Look at your punnett square. What is the probability that the baby giraffe will be a purebred?A: 50%, or 2 out of 4 (ll)

5 - Answer

List the 4 exceptions to Mendel’s findings.

6

4 exceptions:1.Incomplete dominance2.One gene influences

many traits3.Many genes influence one

trait4.Environmental Factors

6 - Answer

A purebred blue flower and a purebred yellow flower are crossed. All of the offspring are green. This is an example of what?

7

A purebred blue flower and a purebred yellow flower are crossed. All of the offspring are green. This is an example of what? Incomplete Dominance

7 - Answer

If this couple has 4 kids, will 3 of them definitely have brown hair and 1 definitely have blond hair? Explain.

FemaleMale B = Brown

hair

b = blond hair

B b

B

b

BB

Bb

Bb

bb

8

If this couple has 4 kids, will 3 of them definitely have brown hair and 1 definitely have blond hair? A: No, this is the probability for each child.

MaleFemale

B = Brown hair

b = blond hair

B b

B

b

BB

Bb

Bb

bb

8 - Answer

List the possible genotypes and phenotypes of this couple’s children. List genotypes first and then the phenotype.

FemaleMale B = Brown

hair

b = blond hair

B b

B

b

BB

Bb

Bb

bb

9

Genotype Phenotype

9 – Cont.Label your board like this:

**Make sure the genotype matches the proper phenotype!

Genotype PhenotypeBB – Brown hairBb – Brown hairbb – Blond hair

FemaleMale B = Brown

hair

b = Blond hair

B b

B

b

BB

Bb

Bb

bb

9 - Answer

What is the probability that this couple will have a hybrid child? List the genotype(s) of the hybrid offspring.

FemaleMale B = Brown

hair

b = blond hair

B b

B

b

BB

Bb

Bb

bb

10

What is the probability that this couple will have a hybrid child? List the genotype(s) of the hybrid offspring.

A: 50% - Bb, Bb

MaleFemale

B = Brown hair

b = blond hair

B b

B

b

BB

Bb

Bb

bb

10 - Answer

A child with albinism has skin without pigment and blue eyes. Both of these traits are determined by one set of instructions. This is an example of which exception to Mendel’s findings?

11

An child with albinism has skin without pigment and blue eyes. Both of these traits are determined by one set of instructions. This is an example of which exception to Mendel’s findings?A: One gene, many traits

11 - Answer

What is the name of the trait that always shows up, if it is present?

12

What is the name of the trait that always shows up, if it is present?A: Dominant

12 - Answer

What is the only combination of alleles that will show the recessive trait? (You must write all the terms that apply)

13

What is the only combination of alleles that will show the recessive trait?A: homozygous recessive OR purebred recessive

13 - Answer

What would you call an organism that shows the dominant trait? List all possibilities.

14

What would you call an organism that shows the dominant trait? List all possibilities. A: Homozygous dominant (purebred dominant) and heterozygous (or hybrid)

14 - Answer

Using the letter “R” to represent an allele, list the 3 possible combinations of alleles.

15

Using the letter “R” to represent an allele, list the 3 possible combinations of alleles.A: RR, Rr, rr

15 - Answer

Kim has curly hair which is a recessive trait (h). What is Kim’s phenotype?

16

Kim has curly hair which is a recessive trait (h). What is Kim’s phenotype?A: curly hair

16 - Answer

Kim has curly hair which is a recessive trait (h). What is Kim’s genotype?

17

Kim has curly hair which is a recessive trait (h). What is Kim’s genotype?A: hh

17 - Answer

Curly haired Kim falls in love with homozygous Henry who has straight hair (H). Will any of their children be purebred?

18

A: No. 100% of their children will be hybrid and will have straight hair.

KimHenry H = Straight

hair

h = curly hair

h h

H

H Hh

Hh

18 - Answer

Hh

Hh

In Mendel’s experiments, what percent of the offspring in the first generation showed the dominant trait?

19

In Mendel’s experiments, what percent of the offspring in the first generation showed the dominant trait?

A: 100% - all of the offspring were purple

19 - Answer

In Mendel’s experiments, what percent of the offspring in the first generation carried the recessive allele?

20

In Mendel’s experiments, what percent of the offspring in the first generation carried the recessive allele?

A: 100% - All of the plants had the genotype Pp, and “p” is the recessive allele

20 - Answer

Different forms of a characteristic are called ________.

21

Different forms of a characteristic are called traits.

21 - Answer

What is heredity? 23

What is heredity? A: Traits passing from parents to offspring

23 - Answer

The allele for freckles is (f). Suppose two non-freckled parents have 4 non-freckled children and 1 freckled child. What are the genotypes of the parents?

24

A: Since both parents have no freckles, there are only 2 possible combinations: FF or Ff. Both parents have to be heterozygous (Ff) in order to have a child that has shows the recessive trait of freckles.

MaleFemale

F = No freckles

f = freckles

F f

F

f ff

Ff

24 - Answer

Ff

FF

A: If either parent is homozygous dominant (FF), all children would show the dominant trait of no freckles.

MaleFemale

F = No freckles

f = freckles

F F

F

f Ff

FF

24 – Answer, cont.

Ff

FF