REVIEW & REHEARSE: 7 GENES and INHERITENCE

!ques1! <i>Check Your Knowledge</i>

Question 7.13

Most genes come in alternative forms called:

  • a) alleles.
  • b) heterozygotes.
  • c) gametes.
  • d) chromosomes.
  • e) homozygotes.

Question 7.14

Traits that are determined by a single gene:

  • a) occur in single-celled organisms, but not in humans.
  • b) are common in humans.
  • c) must occur on the X chromosome.
  • d) include eye color and skin color.
  • e) can have only two alleles.

Question 7.15

Pea plants were well suited for Mendel’s breeding experiments for all of the following reasons except:

  • a) Peas exhibit variations in a number of observable characteristics, such as flower color and seed shape.
  • b) Mendel could control the pollination between different pea plants.
  • c) It is easy to obtain large numbers of offspring from any given cross.
  • d) Many of the characteristics that vary in pea plants are not linked closely on the same chromosome.
  • e) Peas have a particularly long

Question 7.16

The law of segregation states that:

  • a) the transmission of genetic diseases within families is always recessive.
  • b) an allele on one chromosome will always segregate from an allele on a different chromosome.
  • c) gametes cannot be separate andpea plants that are equal.
  • d) the number of chromosomes in a cell is always divisible by 2.
  • e) the two alleles for a given trait segregate into different gametes.