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It’s What Makes Me

Me

Time to Split!

Picture This

Pass the Trait

Mixed Bag

Who are the two

scientists credited for discovering

DNA?

James Watson and Francis

Crick

Scientists describe the shape of the

DNA molecule as this?

Double Helix

Name the 4 nitrogen bases found in DNA and explain

how they bond.

Adenine (A), Thymine (T),

Guanine (G) and Cytosine (C)

A and T bond together.

G and C bond together.

What holds the nitrogen bases

together to make up the rungs of

the ladder in DNA?

Nitrogen bases bond to their

corresponding nitrogen base by hydrogen

bonds

What is the three part basic

building block of DNA called and what are the three parts?

It is called a nucleotide. It is

made up of a sugar called deoxyribose, a phosphate group

and a nitrogen base.

Name the 6 phases of the cell cycle in

order.

Interphase,Prophase, Metaphase,

Anaphase,Telophase and Cytokinesis

This is the stage of the cell cycle where the chromosomes

split at the centromere into two

separate chromatids. Sister chromatids move to opposite poles of the cell.

Anaphase

Explain what happens during

Interphase.

During Interphase the

cell obtains nutrients to

grow. The cell prepares to

divide by making a copy of its DNA.

What stage of the cell cycle does the cell spend most of

its time in?

Interphase

Explain how DNA

replication occurs.

DNA replication is another way of saying the DNA is copied. This occurs during

interphase.

1)Hydrogen bonds between the nitrogen bases break and the two strands

separate much like a zipper coming apart.

2) Nucleotides that are floating in the nucleus fill in correct spots on both strands of DNA. There are now two complete identical double helixes of

DNA

Describe this phenotype.

Blue eyes

This is a picture of one cell in one of the phases in the cell cycle. What

phase is it in?

Metaphase

*You can notice that the

chromosomes are lined up in the

center of the cell.

What is the name of this tool that is used to predict the probability of offspring

genotypes?

Punnett Square

What phase comes directly before this picture? What phase directly follows it?

This cell is in Anaphase so the phase that comes

directly before it is Metaphase and the phase that directly

follows it is Telophase.

The green shape is Thymine and the purple shape is Cytosine.

1) What does the red represent?

2) What does the yellow represent?

3) What is the dark blue on the sides of molecule?

4) What is the aqua on the side of the molecule?

5) What do the small circles in the center of the molecule represent?

1) Red = Adenine

2) Yellow = Guanine

3) Blue = Deoxyribose

4) Aqua = Phosphate group

5) Circles = Hydrogen bonds

In Mendel’s experiments yellow seed color is

dominant to green seed color. Explain why the

phenotype of a pea plant would be yellow seed color if it had a genotype of Yy.

You must use correct vocabulary.

Answers will vary-because yellow is

dominant to green the one dominant allele (Y) masks or hides the one recessive allele and all

you can see is the dominant color.

Explain the below genotypes using two

different sets of vocabulary

(purebred/hybrid or homozygous/heterozygo

us).

1) FF 2) Ff 3) ff

1) Either Homozygous Dominant or Purebred Dominant

2) Heterozygous or Hybrid

3) Either Homozygous Recessive or Purebred Recessive

Angelina Jolie is a hybrid for straight hairline. Brad Pitt is

homozygous recessive for widow’s peak.

Angelina is pregnant AGAIN! (no not really) Predict the

probabilities for both genotype and phenotype by

completing a punnett square.

s s

S

s

Ss Ss

ss ss

50% homozygous recessive, widow’s peak

50% heterozygous, straight hairline

Having a cleft chin is dominant over not having a cleft chin.

Predict the percentages for having a child with a

cleft chin if a hybrid man is crossed with a woman that does not

have a cleft chin.

C c

c

c

Cc cc

Cc

cc

50% woul

d have

a cleft chin

In rabbits, the allele for a spotted coat is dominant over the allele for a solid colored coat. A spotted

rabbit was crossed with a solid color rabbit. The

offspring all had spotted coats. What were the

genotypes of the parents. Explain.

We know that if spotted is dominant and one parent has a solid coat that that parent must

have a genotype of ss because the only way you can see the

recessive trait is to have two recessive alleles. If all offspring

had spotted coats than the other parent must be SS because if it had a recessive allele then that allele would be passed down to 50% of the offspring and 50%

would be solid.

A chromosome is made up of 2 sister

_______________

and held together by a ___________________.

chromatids ,

centromere

This stage ends with the cell membrane pinching into two daughter cells.

This stage is different in an animal cell compared to a plant cell because a plant

cell has a cell wall therefore a cell plate forms

to divide cell in two.

Cytokinesis

Below you are given half a strand of DNA . What would be the

other half?

ATTTGGCGATG

Given-ATTTGGCGATG

Answer-TAAACCGCTAC

What are the different forms of a

gene called?

Alleles

How many chromosomes does

each sex cell (egg and sperm) carry?

Each carry 23 chromosome

s, ½ the number

needed to make a human.