FREE AND STUDY GAMES ABOUT BIOLOGY QUIZ 11 EXAM

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FREE AND STUDY GAMES ABOUT BIOLOGY QUIZ 11 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -36 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: karyotype

Answer:

an individual's chromosome number and appearance; includes the size, banding patterns, and centromere position

Question 2: aneuploid

Answer:

individual with an error in chromosome number; includes chromosome segment deletions and duplications

Question 3: translocation

Answer:

process by which one chromosome segment dissociates and reattaches to a different, nonhomologous chromosome Question 4: In humans, the sex of the offspring is determined by the:

Answer:

sex chromosome carried by the sperm cell

Question 5: A couple has a child with Down syndrome. The mother is 39 years old at the time of delivery. Which of the following is the most probable cause of the child's condition?

Answer:

One of the gametes in the mother most likely underwent nondisjunction during meiosis.

Question 6: trisomy

Answer:

otherwise diploid genotype in which one entire chromosome duplicates Question 7: Which of the following phrases correctly defines what one map unit is?

Answer:

a 1% frequency of recombination between two genes

Question 8: nondisjunction

Answer:

failure of synapsed homologs to completely separate and migrate to separate poles during the meiosis' first cell division Question 9: Boy, dwf w/ aplasia & normal vis bangs a color blind gal, norm ht Man's dad was 6' & both the gals parents: avg ht Dwarfism w/ aplasia is autosomal dom & red green color blindness is X linked rec How many daughters expected to be color-blind w/ aplasia?

Answer:

none Question 10: A woman is found to have 47 chromosomes, including three X chromosomes.Which of the following statements describes her expected phenotype?

Answer:

healthy female of slightly above-average height

Question 11: X inactivation

Answer:

condensing X chromosomes into Barr bodies during embryonic development in females to compensate for the double genetic dose

Question 12: recombination frequency

Answer:

average number of crossovers between two alleles; observed as the number of nonparental types in a progeny's population

Question 13: euploid

Answer:

individual with the appropriate number of chromosomes for their species Question 14: Pseudohypertrophic muscular dystrophy;. Only boys are affected, & they are always born to phenotypically normal parents. Is this disorder likely to be caused by a dominant or recessive allele? Is the inheritance of this trait sex-linked or autosomal?

Answer:

recessive, sex-linked Question 15: Which of the following statements regarding gene linkage is correct?

Answer:

The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them.

Question 16: nonparental (recombinant) type

Answer:

progeny resulting from homologous recombination that exhibits a different allele combination compared with its parents Question 17: Traits controlled by sex-linked recessive genes are expressed more often in males

because:

Answer:

the male has only one gene for the trait.

Question 18: parental types

Answer:

progeny that exhibits the same allelic combination as its parents

Question 19: polyploid

Answer:

individual with an incorrect number of chromosome sets

Question 20: homologous recombination

Answer:

process by which homologous chromosomes undergo reciprocal physical exchanges at their arms, also crossing over Question 21: If cell X enters meiosis, and nondisjunction of one chromosome occurs in one of its daughter cells during meiosis II, how will this affect the gametes at the completion of meiosis?

Answer:

One-quarter of the gametes descended from cell X will be n + 1, one-quarter will be n - 1, and half will be n.

Question 22: chromosome inversion

Answer:

detachment, 180° rotation, and chromosome arm reinsertion Question 23: Inheritance patterns can't always be explained by Mendel's models of inheritance.If a pair of homologous chromosomes fails to separate during meiosis I, select the choice that shows the chromosome # of the 4 resulting gametes w/ respect to the (n)?

Answer:

n + 1; n + 1; n - 1; n - 1 Question 24: Why are males more often affected by sex-linked traits than females?

Answer:

Males only have one X chromosome so they cannot be carriers.Question 25: Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human X chromosome The pts have muscles that weaken over time bc they have absent or decreased dystrophin How likely is it for a woman to have this condition?

Answer:

One-half of the daughters of an affected father and a carrier mother could have this condition.