2.7 (P2) Genetic Variation

Question 1

What does sexual reproduction lead to?

Answer 1

Variation

Question 2

How many chromosomes are in a human body cell?

Answer 2

46

Question 3

How many pairs are in a human body cell?

Answer 3

23

Question 4

How many chromosomes in a gamete?

Answer 4

23

Question 5

What are the female chromosomes?

Answer 5

XX

Question 6

What are the male chromosomes?

Answer 6

XY

Question 7

What are some characteristics controlled by?

Answer 7

1 gene = 2 alleles

Question 8

What is an allele?

Answer 8

A version of a gene

Question 9

What can the allele do?

Answer 9

Control the development of a characteristic

Question 10

What is a dominant allele?

Answer 10

Always expressed in the phenotype even if another allele if present

Question 11

What is a recessive allele?

Answer 11

Only expressed in the phenotype in the absence of a dominant allele

Question 12

What is the equation used to describe characteristics?

Answer 12

Genotype + environment -> phenotype

Question 13

What is your genotype?

Answer 13

Genes an organism possess

Question 14

What is your phenotype?

Answer 14

Observable characteristics

Question 15

What is heterozygous?

Answer 15

An organism containing cells with 2 different alleles for 1 gene

Question 16

What is homozygous?

Answer 16

An organism containing cells with 2 of the same alleles

Question 17

What is this…?

Aa

Answer 17

Heterozygous

Question 18

What is this…?

AA

Answer 18

Homozygous dominent

Question 19

What is this…?

aa

Answer 19

Homozygous recessive

Question 20

What is polydactyly caused by?

Answer 20

A dominant allele

Question 21

What is Polydactyly?

Answer 21

Having extra fingers or toes

Question 22

What is cystic fibrosis caused by?

Answer 22

A recessive allele

Question 23

What is cystic fibrosis?

Answer 23

A disorder of cell membranes causing thick, sticky mucus

Question 24

What is the process of checking unborn babies for genetic diseases?

Answer 24

Embryonic screening

Question 25

What molecules are chromosomes made up of?

Answer 25

DNA

Question 26

What phrase describes DNA?

Answer 26

Double helix

Question 27

What does a gene code for?

Answer 27

A particular combination of amino acids with make a specific protein