Genetics

 Which set of parents can most likely produce a child with type O blood? 

• one parent with homozygous type A blood, and the other parent with homozygous type B blood  
• one parent with heterozygous type A blood, and the other parent with type O blood 
• one parent with type AB blood, and the other parent with type O blood 
• A one parent with type AB blood, and the other parent with type A blood  

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

One of the parents of a child has phenylketonuria (PKU), which is caused by recessive (pp) alleles. The other parent does not have the PKU alleles (PP). What is the chance that the couple will have a child with phenylketonuria (pp)? 

• 0%
• 50%
• 75%
• 100%

Hitchhiker’s thumb (H) is dominant to no hitchhiker’s thumb (h). A woman who does not have hitchhiker’s thumb marries a man who is heterozygous for hitchhiker’s thumb. What is the probable genotypic ratio of their children?

• 0% Hh : 100% hh
• 50% Hh : 50% hh
• 25% Hh : 75% hh
• 100% Hh : 0% hh  

The diagram shows a pedigree for a recessive trait. What is the genotype of individual 10?

• X^hX^h
• X^hY
• X^HX^h
• X^HX^H

 A parent with Type A blood and a parent with Type O blood have a child. Which of the following is a possible genotype of their offspring?   

• I^AI^A
• I^AI^B
• I^Bi  
•  ii

Tags

NGSS.HS-LS3-1

 In  humans, the sex­linked trait of normal blood clotting is dominant to hemophilia. Which of the following shows the genotype for someone who is considered to be a carrier for hemophilia?  

• X^HX^H  
• X^HX ^h
• X ^hX ^h 
• X^HY  

Hemophilia is a sex-linked, recessive disorder.  A man with hemophilia and a woman that does not have hemophilia( and is not a carrier) have a child.  What is the probability that their child will have hemophilia? 

• 100% of children will have hemophilia
•  0% of children will have hemophilia 
• 50% of children will have hemophilia, 50% of children will not 
• 25% of children will have hemophilia, 75% of children will not

In a particular species of plants, when the soil pH is greater than 7, blue flowers are produced. However, when the soil pH is less than 7, pink flowers are produced. Which statement best explains the color change in the plant? 

• Multiple alleles determine the color of the flowers. 
• Polygenic inheritance produces the different flower colors.
• The environment influences the expression of the gene for flower color.   

Why do identical twins become less alike as they grow older?  

• Because the environment plays a role in influencing individuals 
• Because the genetic makeup of the individuals changes
• Because the individuals’ cells undergo mitosis
•  Because the number of recessive alleles exceeds the number of dominant alleles

Why do these Himalayan rabbits exhibit different colors of fur when placed under certain temperature?   

• The environment determines whether the gene for fur pigmentation is expressed.
• The genetic makeup of the rabbits change.
• The rabbit’s color changed in order to attract a mate
• The rabbit’s cells undergo mitosis.