1. Blood type in humans is controlled by ____ alleles with an additional Rh factor that determines _________ .
one; color
two; positive or negative charge
three; shape of blood cells
four; phenotype
2. If two people are heterozygous for cystic fibrosis, what are the chances that their children will have the disease?
25% chance
50% chance
60% chance
none of the above
3. Of the following, which represents a homozygous recessive genotype?
TT
Tt
tt
TTT
4. Blood types in humans are an example of ______, while the outcome of pink flowers when red and white flowers are crossed is an example of ______.
complete dominance; polygenic inheritance
polygenic inheritance; incomplete dominance
sex-linked inheritance; multiple alleles
multiple alleles; incomplete dominance
5. In undisturbed areas, older rock layers lie ____ successively younger rock layers.
below
above
in between
on top of
6. Change in the hereditary features of a type of organism over time is ____.
growth
biogenesis
spontaneous generation
evolution
7. An allele carried on a Y chromosome will affect ______.
all of the female offspring
some of the male and female offspring
all of the male offspring
none of the offspring
8. Which of the follow lists the genetic parts from largest to smallest?
gene; DNA; allele; chromosome
chromosome; DNA; gene; allele
DNA; gene; chromosome; allele
allele; chromosome; DNA; gene
9. Which of the following accurately compares traits controlled by multiple alleles with those controlled by polygenetic dominance?
Polygenic inheritance is a group of genes acting together to produce a wide variety of phenotypes while multiple alleles traits produce more than three phenotypes of that trait.
Polygenic inheritance and multiple allele traits work the same way.
Polygenic inheritance occurs when a group of genes act together to produce one phenotype while multiple alleles produce three or more phenotypes.
Polygenic inheritance traits are produced by a group of genes acting together, while multiple alleles produce a wide variety of phenotypes.
10. Through _______ _______, tomatoes can now be picked and transported great distances before they ripen.
11. Through genetic engineering, scientists are experimenting with methods to change the arrangement of ______ in a gene.
12. Punctuated equilibrium occurs over a relatively ______ period of time, usually as a result of a ________.
13. _________ is a continuous series of mutations and variations over time that results in a new species.
Follow 2 answers
1.B
2.A
3.C
4.D
5.A
6.D
7.C
8.B
9.A
10.selective breeding
11.DNA
12.short; genetic mutation
13.Gradualism
1. DK, but guess at D
2. Agree
3. Agree
4. agree
5. agree
6. agree
7. agree
8. agree
DK the rest.
10. Through selective breeding, tomatoes can now be picked and transported great distances before they ripen.
11. Through genetic engineering, scientists are experimenting with methods to change the arrangement of DNA in a gene.
12. Punctuated equilibrium occurs over a relatively short period of time, usually as a result of a genetic mutation.
13. Gradualism is a continuous series of mutations and variations over time that results in a new species.
1. To determine the answer to this question, we need to understand the concept of blood type inheritance in humans. Blood type is controlled by multiple alleles. There are three alleles involved: A, B, and O. Additionally, there is an additional factor known as the Rh factor, which determines if the blood type is positive or negative.
The correct answer is: three; shape of blood cells.
2. To calculate the chances of their children having the disease, we need to understand the inheritance pattern of cystic fibrosis. Cystic fibrosis is an autosomal recessive disorder, which means both parents must carry the recessive allele (heterozygous) for their children to have the disease.
The chances can be calculated using a Punnett square. When both parents are heterozygous (carrying one normal allele and one cystic fibrosis allele), the chances of having a child with cystic fibrosis is 25% (1 in 4), while the chances of having a child who is a carrier (heterozygous) is 50% (2 in 4), and the chances of having a child who does not carry the disease allele is 25% (1 in 4).
The correct answer is: 25% chance.
3. A homozygous recessive genotype means having two copies of the recessive allele. In the given options, only "tt" represents a homozygous recessive genotype.
The correct answer is: tt.
4. Blood types in humans are an example of multiple alleles, as there are three possible alleles (A, B, O) that contribute to the blood type. The outcome of pink flowers when red and white flowers are crossed is an example of incomplete dominance, where neither allele is completely dominant over the other, resulting in an intermediate phenotype.
The correct answer is: multiple alleles; incomplete dominance.
5. In undisturbed areas, older rock layers lie below successively younger rock layers. This is known as the law of superposition in geology, which states that in an undisturbed sequence of rock layers, the oldest rocks are at the bottom, and the youngest rocks are at the top.
The correct answer is: below.
6. Change in the hereditary features of a type of organism over time is evolution. Evolution is the process of gradual change in the inherited characteristics of a population over successive generations.
The correct answer is: evolution.
7. An allele carried on a Y chromosome will affect all of the male offspring. The Y chromosome is only present in males, so any allele located on the Y chromosome will be inherited by and affect all male offspring.
The correct answer is: all of the male offspring.
8. The correct order of genetic parts from largest to smallest is chromosome; DNA; gene; allele.
A chromosome is a structure made up of DNA and proteins that carry genetic information. DNA is the molecule that contains the genetic instructions. A gene is a specific segment of DNA that codes for a specific protein or trait. An allele is a variant form of a gene.
The correct answer is: chromosome; DNA; gene; allele.
9. Traits controlled by multiple alleles and polygenic dominance have distinct differences. Polygenic inheritance occurs when a group of genes acts together to produce one phenotype, while multiple alleles produce more than three phenotypes of that trait.
The correct answer is: Polygenic inheritance traits are produced by a group of genes acting together, while multiple alleles produce a wide variety of phenotypes.
10. Through selective breeding, tomatoes can now be picked and transported great distances before they ripen. Selective breeding is a process in which humans choose specific plants or animals with desired traits and selectively mate them to produce offspring with those desired traits.
11. Through genetic engineering, scientists are experimenting with methods to change the arrangement of DNA in a gene. Genetic engineering is the process of modifying an organism's genetic information using biotechnology techniques.
12. Punctuated equilibrium occurs over a relatively short period of time, usually as a result of a genetic mutation. Punctuated equilibrium is a theory in evolutionary biology that suggests that species usually undergo long periods of relatively little change (equilibrium), interrupted by short periods of rapid change (punctuation).
13. Gradualism is a continuous series of mutations and variations over time that results in a new species. Gradualism is the theory that evolution occurs slowly and gradually over long periods of time through the accumulation of small changes.