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Flashcards in Lesson 7 Deck (20):
1

How many chromosomes in the human cell are autosomes?

44

2

How many chromosomes in the human cell are sex chromosomes?

2

3

In the XO system, what happens when the male passes on a sex chromosome?

Female (male only passes X, offspring will be XX, aka female)

4

A female brown trout with two different sex chromosomes is?

ZW (for female) (if male it's ZZ)

5

What does it mean for a disorder to be sex-linked?

The genes for coding that trait are found on the X chromosome

6

Why are men more affected by recessive sex-linked diseases?

Because men only have one X chromosome, so if that chromosome gets infected, then they will have the disease

7

What are the phenotype possibilities for a colorblind mother and a normal father?

All male offspring will be colorblind, female offspring will not

8

What does a person with hemophilia lack?

A protein that clots their blood

9

What does it mean for a trait to be sex-influenced?

The traits express themselves differently based on the sex of the individual

10

What does it mean when a trait is sex-limited?

The trait will only occur in one sex or the other

11

Define nondisjunction

The unequal division of chromosomes during meiosis

12

When can nondisjunction occur

during the first or second meiotic division

13

The difference for gametes in the stages of nondisjunction

first stage, all affected. second stage, two normal, one with an extra, and one missing a chromosome

14

Genotypes of mother with Type A, father with type B, and child with type O

Mother would be AO and father with BO

15

What blood type is the following cell?

AB

16

Probability of a type A mother and a Type AB father having a type O child?

0%

17

Probability of a type BO mother and a AO father having a type O child?

25%

18

When does the law of assortment not work?

When genes are located close together on the same chromosome

19

How can you tell when genes are linked?

The offspring show more than 2 parental types for two different traits than there are combinants

20

Describe what happens during crossing over

homologous chromosomes exchange genetic material, mixing up the combinations of traits