- In humans, tongue rolling (T) is dominant to non-tongue rolling. If a homozygous dominant tongue roller marries a homozygous recessive non tongue-roller, what percentage of the offspring would you expect to be tongue-rollers?
Your answer:
25%
50%
100%
75%
- In humans, what is the probability that a couple's first child will be a boy?
Your answer:
3/4
1/2
1/4
4/4
- A widow's peak is dominant and the lack of widow's peak is recessive. If a heterozygous individual with a widow's peak mates with a person without a widow's peak, what is the probability of the children having a widow's peak?
Your answer:
100%
50%
25%
75%
- A Punnett square:
Your answer:
helps scientists to record and describe the microscopic world at extremely high magnifications.
helps geneticists organize the results of a cross between the sex cells of two individuals.
helps detect the radiation released by radioactive decay.
helps geneticists organize the elements, indicating the atomic number, electron number, and atomic mass.
- Free earlobes are those that hang below the point of attachment to the head. Attached ear lobes are attached directly to the side of the head. Free earlobes are dominant and attached earlobes are recessive. Two heterozygous free earlobed individuals mate and produce 4 offspring. How many of the 4 would you expect to have ATTACHED earlobes?
Your answer:
3
4
1
2
- In short-horned cattle, if a red bull is crossed with a white cow, all the offspring are roan, a shade between red and white. A cross between roans should yield offspring in the ratio of: (use a separate sheet of paper)
Your answer:
3 white: 1 red
3 roan: 1 white
3 red: 1 white
1 red: 2 roan: 1 white
- The straight thumb is dominant and the hitchhiker thumb is recessive. Cross these two genotypes: A person who is homozgyous dominant for a straight finger mates with a person with a hitchhikers thumb. What is the probability of the children inheriting the HITCHHIKER thumb?
Your answer:
50%
0%
100%
75%
- Color blindness is a sex-linked characteristic because the gene is:
Your answer:
carried on an autosome
dominant
recessive
carried on the sex chromosome
- Two or more alternative types of a gene are _________________.
Your answer:
phenotypes
hyrids
alleles
genotypes
- Gregor Mendel is important in the field of biology because ---
Your answer:
he unvieled an electron microscope with 7000x magnification.
he concluded that microbes could not be created from non-living broth.
he was the first to identify cell walls in a plant cell.
his experiments with garden peas laid the foundation for the science of genetics.