Nine Weeks Test Week 4 Flashcards Preview

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Flashcards in Nine Weeks Test Week 4 Deck (37)
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1

How does a geneticist use pedigrees

To trace the inheritance of traits in humans

2

What is a pedigree

A chart that tracks which members of a family have a particular trait

3

Genetic disorders are caused by

DNA mutations or changes in chromosomes.

4

What would be the best way to predict the probability of a baby having cystic fibrosis

By studying the parents pedigree chart

5

A carrier is a person who has

One recessive and one dominant allele for a trait

6

What must occur for a girl to be colorblind

Each parent must have the recessive allele for colorblindness

7

Hemophilia is caused by

a recessive allele on the X chromosome

8

Down syndrome most often occurs when

Chromosomes fail to separate properly during meiosis

9

What genetic disorder results in abnormally shaped blood cells

Sickle cell disease

10

A DNA molecule is shaped like a

Spiral staircase

11

During DNA replication, adenine always pairs with

Thymine

12

Each ring of the DNA ladder is made of

A pair of nitrogen bases

13

A change in one or a few nucleotides that occur at a single point in a DNA sequence is known as a

Point mutation

14

A mutation that can change every amino acid following the point of mutation is known as

Frameshift

15

What r the different types of frame shift mutations

Insertion and deletion

16

What is the first thing U do when u look at a pedigree chart

Look for alike parents with different kids

17

What is the probability of producing a tall pea plant from a genetic cross between two hybrid tall pea plant

Three in four or 75%

18

If a homozygous black Guinea pig is crossed with a homozygous white Guinea pig, what is the probability that an offspring will have black fur.
Black is dominant

100%

19

A purebred chicken with white feathers is crossed with a purebred chicken with black feathers. Each of their offspring has both black and white feathers. Why does this happen

Both alleles for feather color are dominant

20

When sex cells combined to produce offspring, each six so will contribute

Half the number of chromosomes in body cells

21

Why are sex-linked traits more common in males than in females

A recessive allele on the X chromosome will always produce trait in a male

22

What must occur for a girl to be colorblind

Each parent must have a recessive allele for color blindness

23

Factors that control traits are called

Genes

24

Scientists call an organism that has two different alleles for a trait a...

Hybrid

25

What does the notation TT mean to geneticists

Two dominant alleles

26

What does the notation Tt mean to geneticists

One dominant allele and one recessive allele

27

What is probability

A number that describes how likely it is that an event will occur

28

What does a punnet square show

All possible outcomes of a genetic cross

29

And organisms physical appearance is it

Phenotype

30

The different forms of a gene are called

Alleles