AP Bio Linked Genes

If results of recombination do NOT follow Mendel's Law of Independent Assortment, genes are likely to be - - - 

• shuffled during meiosis
• linked
• inherited
• on separate chromosomes

Tags

NGSS.HS-LS3-2

The reason some linked genes may get separated during gamete formation is - - - 

• genes aren't on the same chromosome
• genes don't compliment each other well
• a crossing over event shuffles the genes
• an environmental impact forces the genes to shuffle

Tags

NGSS.HS-LS3-2

 CROSS I. Purebred lines of wild-type fruit flies (gray body and normal wings) are mated to flies with black bodies and vestigial wings.    F1 offspring all have a normal phenotype. 
 CROSS II. F1 flies are crossed with flies recessive for both traits (a testcross).
 Result. Offspring          Normal   Percent
 Gray body; normal wings  585     26.1
Black body; vestigial wings 581   25.9
Black body; normal wings  567    24.2
Gray body; vestigial wings  558   25.8
Based on the above information, choose the best answer for the following statement:
Vestigial wings are a recessive trait

• CROSS I results give evidence supporting the statement.
• CROSS I results give evidence against the statement.
• CROSS II results give evidence supporting the statement.
• CROSS II results give evidence against the statement.  

Tags

NGSS.HS-LS3-2

 CROSS I. Purebred lines of wild-type fruit flies (gray body and normal wings) are mated to flies with black bodies and vestigial wings.    F1 offspring all have a normal phenotype. 
 CROSS II. F1 flies are crossed with flies recessive for both traits (a testcross).
 Result. Offspring          Normal   Percent
 Gray body; normal wings  575     25.1
Black body; vestigial wings 571   24.9
Black body; normal wings  577    25.2
Gray body; vestigial wings  568   24.8
Based on the above information, choose the best answer for the following statement:
The genes for body color and wing shape are linked. 

• CROSS I results give evidence supporting the statement.
• CROSS I results give evidence against the statement.
• CROSS II results give evidence supporting the statement.
• CROSS II results give evidence against the statement.  

genes that are physically located on the same chromosomes close together

• linked genes

• multiple alleles

• codominance

• polygenic inheritance

• incomplete dominance

For any given trait there may be more than two choices for alleles, the trait may be inherited on more than one gene or chromosome, and there are many types of inheritance patterns it may follow, however, for each trait you may only inherit how many alleles?

• 1
• 2
• 23
• 46

Tags

NGSS.HS-LS3-1

A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?

• 3/16
• 4/16
• 8/16
• 12/16

Tags

NGSS.HS-LS3-3

Hemophilia is a sex-linked recessive trait found on the x chromosome.  Complete a cross between a woman who has hemophilia and a normal man.
What are the chances of a child having hemophilia?

• 100%
• 75%
• 50%
• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3