10.2 Dihybrid Crosses and Gene Linkage Flashcards Preview

Biology > 10.2 Dihybrid Crosses and Gene Linkage > Flashcards

Flashcards in 10.2 Dihybrid Crosses and Gene Linkage Deck (24):
1

Distinguish between autosomes and sex chromosomes

Sex chromosomes
• X and Y chromosomes
• Causes determination of gender
• 1 pair
• Carry sex linked genes
○ e.g. haemophilia
• Y is much shorter than X
• X has non-homologous region

Autosomes
• All other chromosomes
• Carry genes
• 22 homologous pairs

2

Distinguish between autosomes and sex chromosomes

Sex chromosomes
• X and Y chromosomes
• Determine gender
• 1 pair
• Carry sex linked genes
- e.g. haemophilia
• Y is much shorter than X
• X has non-homologous region

Autosomes
• All other chromosomes
• Carry genes
• 22 homologous pairs

3

Distinguish between autosomes and sex chromosomes

Sex chromosomes
• X and Y chromosomes
• Causes determination of gender
• 1 pair
• Carry sex linked genes
○ e.g. haemophilia
• Y is much shorter than X
• X has non-homologous region

Autosomes
• All other chromosomes
• Carry genes
• 22 homologous pairs

4

Distinguish between autosomes and sex chromosomes

Sex chromosomes
• X and Y chromosomes
• Causes determination of gender
• 1 pair
• Carry sex linked genes
○ e.g. haemophilia
• Y is much shorter than X
• X has non-homologous region

Autosomes
• All other chromosomes
• Carry genes
• 22 homologous pairs

5

Distinguish between autosomes and sex chromosomes

Sex chromosomes
• X and Y chromosomes
• Causes determination of gender
• 1 pair
• Carry sex linked genes
○ e.g. haemophilia
• Y is much shorter than X
• X has non-homologous region

Autosomes
• All other chromosomes
• Carry genes
• 22 homologous pairs

6

Distinguish between autosomes and sex chromosomes

Sex chromosomes
• X and Y chromosomes
• Causes determination of gender
• 1 pair
• Carry sex linked genes
○ e.g. haemophilia
• Y is much shorter than X
• X has non-homologous region

Autosomes
• All other chromosomes
• Carry genes
• 22 homologous pairs

7

Distinguish between autosomes and sex chromosomes

Sex chromosomes
• X and Y chromosomes
• Causes determination of gender
• 1 pair
• Carry sex linked genes
○ e.g. haemophilia
• Y is much shorter than X
• X has non-homologous region

Autosomes
• All other chromosomes
• Carry genes
• 22 homologous pairs

8

Distinguish between autosomes and sex chromosomes

Sex chromosomes
• X and Y chromosomes
• Causes determination of gender
• 1 pair
• Carry sex linked genes
○ e.g. haemophilia
• Y is much shorter than X
• X has non-homologous region

Autosomes
• All other chromosomes
• Carry genes
• 22 homologous pairs

9

 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in the exchange of alleles

• During crossing over in prophase I, non-sister chromatids of a homologous pair may break and reform at points of attachment called chiasmata
• As these chromatids break at the same point, any gene loci below the point of the break will be exchanged as a result of recombination
• This means that maternal and paternal alleles may be exchanged between the maternal and paternal chromosomes, creating new gene combinations
• The further apart two gene loci are on a chromosome, the more likely they are to be exchanged

10

Define linkage group

• A linkage group is a group of genes found on the same chromosome
• They do not follow the law of independent assortment
• Linked genes will tend to be inherited together, which results in fewer genetic combinations
– The only way to separate them is through recombination (via crossing over during synapsis)

Linked genes are represented as vertical pairs

11

 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in the exchange of alleles

• During crossing over in prophase I, non-sister chromatids of a homologous pair may break and reform at points of attachment called chiasmata
• As these chromatids break at the same point, any gene loci below the point of the break will be exchanged as a result of recombination
• This means that maternal and paternal alleles may be exchanged between the maternal and paternal chromosomes, creating new gene combinations
• The further apart two gene loci are on a chromosome, the more likely they are to be exchanged

12

Define linkage group

• A linkage group is a group of genes found on the same chromosome
• They do not follow the law of independent assortment
• Linked genes will tend to be inherited together, which results in fewer genetic combinations
– The only way to separate them is through recombination (via crossing over during synapsis)

Linked genes are represented as vertical pairs

13

 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in the exchange of alleles

• During crossing over in prophase I, non-sister chromatids of a homologous pair may break and reform at points of attachment called chiasmata
• As these chromatids break at the same point, any gene loci below the point of the break will be exchanged as a result of recombination
• This means that maternal and paternal alleles may be exchanged between the maternal and paternal chromosomes, creating new gene combinations
• The further apart two gene loci are on a chromosome, the more likely they are to be exchanged

14

Define linkage group

• A linkage group is a group of genes found on the same chromosome
• They do not follow the law of independent assortment
• Linked genes will tend to be inherited together, which results in fewer genetic combinations
– The only way to separate them is through recombination (via crossing over during synapsis)

Linked genes are represented as vertical pairs

15

 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in the exchange of alleles

• During crossing over in prophase I, non-sister chromatids of a homologous pair may break and reform at points of attachment called chiasmata
• As these chromatids break at the same point, any gene loci below the point of the break will be exchanged as a result of recombination
• This means that maternal and paternal alleles may be exchanged between the maternal and paternal chromosomes, creating new gene combinations
• The further apart two gene loci are on a chromosome, the more likely they are to be exchanged

16

Define linkage group

• A linkage group is a group of genes found on the same chromosome
• They do not follow the law of independent assortment
• Linked genes will tend to be inherited together, which results in fewer genetic combinations
– The only way to separate them is through recombination (via crossing over during synapsis)

Linked genes are represented as vertical pairs

17

 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in the exchange of alleles

• During crossing over in prophase I, non-sister chromatids of a homologous pair may break and reform at points of attachment called chiasmata
• As these chromatids break at the same point, any gene loci below the point of the break will be exchanged as a result of recombination
• This means that maternal and paternal alleles may be exchanged between the maternal and paternal chromosomes, creating new gene combinations
• The further apart two gene loci are on a chromosome, the more likely they are to be exchanged

18

Define linkage group

• A linkage group is a group of genes found on the same chromosome
• They do not follow the law of independent assortment
• Linked genes will tend to be inherited together, which results in fewer genetic combinations
– The only way to separate them is through recombination (via crossing over during synapsis)

Linked genes are represented as vertical pairs

19

 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in the exchange of alleles

• During crossing over in prophase I, non-sister chromatids of a homologous pair may break and reform at points of attachment called chiasmata
• As these chromatids break at the same point, any gene loci below the point of the break will be exchanged as a result of recombination
• This means that maternal and paternal alleles may be exchanged between the maternal and paternal chromosomes, creating new gene combinations
• The further apart two gene loci are on a chromosome, the more likely they are to be exchanged

20

Define linkage group

• A linkage group is a group of genes found on the same chromosome
• They do not follow the law of independent assortment
• Linked genes will tend to be inherited together, which results in fewer genetic combinations
– The only way to separate them is through recombination (via crossing over during synapsis)

Linked genes are represented as vertical pairs

21

 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in the exchange of alleles

• During crossing over in prophase I, non-sister chromatids of a homologous pair may break and reform at points of attachment called chiasmata
• As these chromatids break at the same point, any gene loci below the point of the break will be exchanged as a result of recombination
• This means that maternal and paternal alleles may be exchanged between the maternal and paternal chromosomes, creating new gene combinations
• The further apart two gene loci are on a chromosome, the more likely they are to be exchanged

22

Define linkage group

• A linkage group is a group of genes found on the same chromosome
• They do not follow the law of independent assortment
• Linked genes will tend to be inherited together, which results in fewer genetic combinations
– The only way to separate them is through recombination (via crossing over during synapsis)

Linked genes are represented as vertical pairs

23

 Explain how crossing over between non-sister chromatids of a homologous pair in prophase I can result in the exchange of alleles

• During crossing over in prophase I, non-sister chromatids of a homologous pair may break and reform at points of attachment called chiasmata
• As these chromatids break at the same point, any gene loci below the point of the break will be exchanged as a result of recombination
• This means that maternal and paternal alleles may be exchanged between the maternal and paternal chromosomes, creating new gene combinations
• The further apart two gene loci are on a chromosome, the more likely they are to be exchanged

24

Define linkage group

• A linkage group is a group of genes found on the same chromosome
• They do not follow the law of independent assortment
• Linked genes will tend to be inherited together, which results in fewer genetic combinations
– The only way to separate them is through recombination (via crossing over during synapsis)

Linked genes are represented as vertical pairs