3.4,10.2

Question 1

Gametes are haploid so they _________

Answer 1

Contain only one allele of each gene

Question 2

The 2 alleles of each gene separate into different _____ ______ nuclei during meiosis

Answer 2

Haploid

Daughter

Question 3

Fusion of gametes results in diploid Zygotes with two alleles of each gene that may be the same allele or different alleles

Answer 3

Meaning they can be either homozygous or heterozygous

Question 4

Dominant alleles mask the effects of recessive allele but co-dominant alleles have joint effects

Dominant vs. Recessive

Answer 4

Dominant:
One big letter takes over
Always shown when allele is shown

Recessive:
Not always shown
Can be enter mixed with dominant alleles
Has to be both recessive alleles to be show

Question 5

Many genetic diseases for humans are due to _______ _________

Answer 5

Recessive alleles

Question 6

Some genetic diseases are due to ______ or __-________ alleles (when not due to autosomal)

Answer 6

Dominant

Co-dominant

Question 7

The pattern of inheritance is different with sex linked genes due to their location on _______

Answer 7

Sex chromosomes

Question 8

Most genetic diseases are _____

Answer 8

Rare

Question 9

What can cause a mutation? (Genetic diseases and cancer too)

Answer 9

• radiation

* mutagenic chemicals

Question 10

Gene loci are said to be linked if on the same __

Answer 10

Chromosome

Question 11

_______ genes segregate independently as a result of meiosis

Answer 11

I liked

Question 12

Variation can be discrete or

Answer 12

Continuous

Question 13

The phenotypes apologetic characteristics tend to show _____

Answer 13

Continuous variation

Question 14

Examples of codominance

Answer 14

• silly cell

* blood type

Question 15

Examples of multiple alleles

Answer 15

•blood type

Question 16

Examples of sex linked genes

Answer 16

• Red green colorblindness

* hemophilia

Question 17

Examples of polygenetic

Answer 17

• hair
• eye color
• skin color

Question 18

Define Gene loci

Answer 18

Specific positions of genes on a chromosome

Question 19

What constitutes a linkage group?

Answer 19

Genes carried on the same chromosome

Question 20

Define the terms gene and allele and explain how they differ

Answer 20

A gene is a heritable factor. An allele is a form of a gene.

Alleles of a gene occupy the same gene locus/same position on the chromosome

Small number of base/base pairs

Question 21

What is the relationship between Mendels laws location and meiosis

Answer 21

Only one of a pair of alleles appears in a gamete

Question 22

Outline 1 example of inheritance involving multiple alleles.

Answer 22

• more than 2 alleles for a gene
• blood type/3 alleles
• A, B, AB, O
• A= I^a. B=I^b. O= I^i
• 2 alleles per person. Get one from each parent

Question 23

Define the term gene linkage and outline an example of a cross between two linked genes

Answer 23

[9]
14. (a) pair of genes on same chromosome;

do not follow expected ratio in cross between heterozygous parents;

more offspring with parental characteristics;

genes tend to be inherited together;

P genotype shown;

P phenotype stated;

gametes;

F1 genotype;

F1 phenotype;

gametes;
F2 genotype;
F2 phenotype;
eg
L = long wings
l = short wings
R = red eyes
r = white eyes
P			
long wing red eyes x short wings white eyes;
Gametes 	
F1		
100% long wings, red eyes;
Gametes  and 
F2				
75% long wings, red eyes		25% short wings white eyes;	8 max

Question 24

Mendel discovered the principles of inheritance with experiments in which large numbers of pea plants crossed

Answer 24

Understanding