BIO Chapter 10 Homework
A pea plant is heterozygous for the genes for seed form (Rr) and seed color (Gg). It is crossed with a pea plant of the genotype rrgg. How many of the 60 offspring of this mating are predicted to show the dominant trait for both genes? (The genes are not linked.)
15
The Punnett square below represents a cross between two parents that are heterozygous for the F gene. What percentage of the offspring are predicted to be heterozygous for the F gene?
50%
What is the inheritance pattern of the disorder shown in the pedigree?
Autosomal recessive
What is the correct relationship among "chromosomes," "alleles," and "proteins"?
Each chromosome has one allele for each of its genes. That allele may confer a functional or nonfunctional protein.
Analyze the genotypes and phenotypes shown in the Punnett square below. Then, click on the term that describes the expression of the F gene. (Select the one correct answer.)
Incomplete dominance
Assume that a recessive allele (f) is associated with a severe language disorder. An unaffected male wants to determine the genotypes of his wife, his parents, and himself. His mother has the language disorder. Neither he nor his wife has the language disorder, but one of their five children does. What is the genotype for each individual? Answers may be used more than once or not at all. (Note: the gene associated with this language disorder is on an autosome.)
Mother: ff Father: either FF or Ff Wife: Ff Himself: Ff
According to the ___, offspring from these two parents have a __% chance of inheriting two b alleles. Individuals that inherit two b alleles are ___. Inheriting two b alleles confers the ___ of blue eyes.
Punnett square, 50%, homozygonus recessive, phenotype
A ___ is a series of nucleotides that encodes a protein product
gene
Whatever the form, these regions are found at a specific location, or ___, on long strands of DNA, called ___.
locus, chromosomes
What is the genotype of the right-most individual in row II?
homozygous dominant
Why do recessive X-linked traits occur more frequently and with greater severity in human males than in human females?
-Males don't have a second X chromosome to mask the effects of the first one. -Only females who inherit two X-linked recessive alleles fully express the recessive phenotype.
If a female with genotype Dd mates with a male of genotype dd, what are the possible genotypes of the haploid gametes they produce?
-The male can only produce d gametes -The female can produce D and d gametes
Study the image below, then click on all of the true statements.
-These homologous chromosomes have different alleles -Gene A can have alleles A or a at its locus -Sister chromatids always have the same alleles
Suppose the second male from the left in row III had a child with the female on the far right side of row III. What percentage of their offspring will be affected?
0%
This coding DNA may have different forms, or varieties, called
alleles
An individual with two different versions of a gene is genetically ___. In traits with a simple pattern of inheritance, only the trait conferred by the ___ form of the gene will be visible. The other form of the gene is ___. It confers a trait that is only visible when the individual is genetically ___, or has two identical copies of the gene.
heterozygous, dominant, recessive, homozygous
The Punnett square below represents a cross between two parents that are heterozygous for the F gene. The parents have already had three offspring. The first had genotype FF and the second and third had genotype Ff. What is the probability that the fourth child has genotype ff?
0.25
According to the Punnett square, offspring from these two parents have a __% chance of inheriting one B allele and one b allele. Individuals that inherit these two alleles are ___for the B gene. Inheriting Bb confers the ___ of brown eyes.
50%, heterozygous, phenotype
