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Biology - MCAS Practice - Non-Mendelian and Pedigrees

Last updated 5 months ago
13 questions
1

A man and a woman plan to have a biological child. They want to determine the likelihood that their child will inherit a genetic condition that runs in both of their families. One gene with two alleles is responsible for the condition. The dominant allele (A) produces the normal phenotype, and the recessive allele (a) produces the genetic condition. Both the man and the woman have the normal phenotype.

After doing some research, they determine the genetic condition is X-linked.
Drag and drop allele pairs into the boxes to identify all possible genotypes of the man and all possible genotypes of the woman. Each allele pair may be used once, more than once, or not at all.

  • XAXA
  • XAXa
  • XaXa
  • XAY
  • XaY
  • Male
  • Female
1

Complete a Punnett square with the parental genotypes identified in Part C that could produce a child with this X-linked genetic condition.

Identify the percentage of males that are expected to have the genetic condition based on this Punnett square.

1

Guinea pigs have two fur colors - Black, which is dominant and white is recessive. A breeder has a black guinea pig and wants to figure out whether it is heterozygous (Bb) or homozygous (BB). The breeder decides to breed the black guinea pig with another one to figure it out.

Part A
How can breeding the guinea pig and producing offspring help determine the parent genotypes?

Part B
What color guinea pig would the breeder have to cross with the black guinea pig to determine the black guinea pig's genotype? Why?

1

In horses, there are two color alleles - black and chestnut. If a black female horse and a chestnut male horse produce a horse with black and chestnut spotting, it can be assumed that

1

What is happening in the picture above?

1

Traits that are controlled by genes on the X chromosome are said to be

1

A pedigree is a diagram that traces the inheritance of a trait through a family, starting with parents who both have it. Which of the following patterns is typical in a pedigree for an autosomal dominant trait?

1

In homozygous individuals, two IA alleles result in blood type A and two IB alleles result in blood type B. The IA and IB alleles are codominant, resulting in blood type AB in individuals heterozygous for the two alleles.
A male and a female both have blood type AB. If they have a child, what is the probability that the child will also have blood type AB?

1

A gene in horses controls whether the horse has a white coat or a colored coat. A white female horse and a white male horse are the parents of a total of five female offspring. Three of these offspring have white coats. The other two offspring have colored coats. The phenotypes of the horses suggest which of the following as the most likely pattern of inheritance for coat color?

1

Leaves from two white clover plants, each with a different pattern, are shown below



The leaf patterns are genetically determined by alleles of a single gene. Plant 1 is homozygous for the chevron allele. Plant 2 is homozygous for the oval allele. The chevron and oval alleles are codominant.
If plant 1 and plant 2 are crossed, the codominance of the alleles will most likely result in which of the following leaf patterns on the offspring plants?

1

Shelly and Jason are siblings, but Shelly looks like their father while Jason looks like their mother. Which of the following statements best explains the different in Shelly and Jason's features?

1

People who are tune deaf are unable to follow a rhtym. Scientists have evidence that tune deafness can be genetic. The pedigree below traces the inheritance of tune deafness in a family. Individuals in the pedigree are numbered.

Scientists have analyzed the inheritance patterns for tune deafness and have concluded that tune deafness is caused by an autosomal dominant allele, T.
a. Provide evidence from the pedigree that conclusively shows that the tune deafness allele is autosomal dominant, not autosomal recessive. Explain your reasoning.
b. Identify the genotypes of individuals 5 and 6, and then draw the Punnett square for the cross of these two individuals.
c. Compare the expected percentage of each phenotype of the offspring from the cross in part (b) with the actual percentage of each phenotype observed in the children of individuals 5 and 5.

1

In rabbits, a single gene controlling coat color has four alleles. The inheritance pattern for coat color in rabbits is therefore best described as which of the following?