Chapter 5 (Sections 1 & 2) Heredity Review Game

An organism with two dominant alleles or two recessive alleles is called ______________. 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? 3

A: Gregor Mendel 3 - Answer

Draw a punnett square labeled like this: Male Female 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 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 dominance 2.One gene influences many traits 3.Many genes influence one trait 4.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? Male Female B = Brown hair b = blond hair B b B b 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 Male Female B = Brown hair b = blond hair B b B b BB Bb bb 8 - Answer

List the possible genotypes and phenotypes of this couple’s children. List genotypes first and then the phenotype. Male Female B = Brown hair b = blond hair B b B b BB Bb bb 9

Genotype Phenotype 9 – Cont. Label your board like this: **Make sure the genotype matches the proper phenotype!

Genotype Phenotype BB – Brown hair Bb – Brown hair bb – Blond hair Male Female B = Brown hair b = Blond hair B b B b 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. Male Female B = Brown hair b = blond hair B b B b 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 Male Female B = Brown hair b = blond hair B b B b BB Bb bb 10 - Answer

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? 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? 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

Claire has curly hair which is a recessive trait (h). What is Claire’s phenotype? 16

Claire has curly hair which is a recessive trait (h). What is Claire’s phenotype? A: curly hair 16 - Answer

Claire has curly hair which is a recessive trait (h). What is Claire’s genotype? 17

Claire has curly hair which is a recessive trait (h). What is Claire’s genotype? A: hh 17 - Answer

Curly haired Claire 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. Henry Claire H = Straight hair h = curly hair H H h hHh 18 - Answer 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

To receive 5 points of extra credit on the test, write down the answers to the questions on this slide and the next on a piece of notebook paper, and turn it in on Monday. Your answers must be correct to receive credit. You may check your answers with your teacher before school on Monday. EXTRA CREDIT ALERT 1.What are the 4 exceptions to Mendel’s principles? AND Give an example of each exception from your textbook. 2.What is the name of the trait that always shows up if it is present? 3.What is the term for a feature that shows up in a population and has different forms?

EXTRA CREDIT ALERT (Continued) 4.What is the term for the different forms of a feature? 5.Draw and label a punnett square. Fill it in with a cross between a homozygous dominant female and a heterozygous male. Use the letter “T” to represent the alleles. 6.What are the two combinations of alleles that would show the dominant trait? 7.What is the only combination of alleles that would show the recessive trait? 8.What is a synonym (means the same thing as) for heterozygous? 9.What is a synonym (means the same thing as) for homozygous? 10.Write the definition for heredity.

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 Answer

What happened to the recessive traits in the second generation of Mendel’s experiments? 22

What happened to the recessive traits in the second generation of Mendel’s experiments? A: They reappeared in 1 out of 4 plants, or 25% of the plants 22 - 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. Male Female F = No freckles f = freckles F f F fff Ff 24 - Answer Ff FF

A: If either parent is homozygous dominant (FF), all children would show the dominant trait of no freckles. Male Female F = No freckles f = freckles F F F fFf FF 24 – Answer, cont. Ff FF