Homework Answers
6.
Parental Cross: True-breeding Grey male x True breeding Ebony female
F1: Grey Bodies (Grey is dominant to Ebony)
When F1 is selfed, each F1 has one Grey allele and one Ebony allele. Since Ebony is recessive to Grey, only the progeny that would receive both Ebony alleles from either F1 parent will be ebony. This has a probability of 1/2 * 1/2 = 1/4
Thus, 25% of the F2 will have an Ebony body.
7.
Similar to the previous question, here both parents are heterozygous for the Cystic Fibrosis causing allele. Therefore, the chance of each parent passing on the CF causing allele to their child is 1/2.
Thus, the probability that the child of this couple has Cystic Fibrosis is 1/4.
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6. A true-breeding male fruit fly with a gray body was crossed with a true-breeding ebony-bodied...
In the fruit fly Drosophila, a rudimentary wing called "vestigial" and dark body color called "ebony"...
In the fruit fly Drosophila, a rudimentary wing called "vestigial" and dark body color called "ebony" are inherited at independent loci and are recessive to their dominant wild-type counterparts, full wing and gray body color. Dihybrid wild-type males and females are crossed, and 4800 progeny are produced. How many progeny flies are expected to have vestigial wings and gray bodies? How many progeny flies are expected to have full wings and gray bodies? How many progeny flies are expected to...
A pure-breeding fruit fly with curled wings mates with a pure-breeding fruit fly with normal (straight)...
A pure-breeding fruit fly with curled wings mates with a pure-breeding fruit fly with normal (straight) wings. The F1 mate with each other to produce an F2 generation that consists of 160 flies with curled wings and 80 with straight wings. What can you infer from this observation? A. Wing shape is controlled by two codominant alleles. B. All of the hybrid F1 flies had straight wings C. Two interacting genes determine wing shape. D. The dominant curled wing allele...
E10 from Brooker: In fruit flies, curved wings are recessive to straight wings, and ebony body...
E10 from Brooker: In fruit flies, curved wings are recessive to straight wings, and ebony body is recessive to gray body. A cross was made berween true-breeding flies with curved wings and pray bodies and flies with straight wings and ebony bodies. The F1 offspring were then mated to flies with curved wings and ebony bodies to produce an F2 generation. A. Diagram the genotypes of this cross starting with the parental generation and ending with the Frencration B. What...
could someone help me figure out how to do these pleaseeee A female fruit fly who...
could someone help me figure out how to do these
pleaseeee
A female fruit fly who is heterozygous with the phenotype gray body, red eyes & long wings is crossed with a male who is homozygous recessive (black body, purple eyes, vestigial wings). The observed offspring are shown below: # offspring, body color. eye color. wing length 411 gray red long 61 gray red vestigial 2 gray purple long 30 gray purple vestigial 28 black red long black red vestigial...
3-3. In the fruit fly, Dichaete (D) is a dominant autosomal mutation that affects wing shape;...
3-3. In the fruit fly, Dichaete (D) is a dominant autosomal mutation that affects wing shape; it is lethal when homozygous. Ebony body, e, and rose eye, r, are recessive mutations also located on the same chromosome. Dichaete flies were crossed to pure-breeding ebony, rose flies. Among the F1 were Dichaete progeny with normal body and eye color. Female Dichaete F1 were test-crossed to ebony, rose males, with the results listed below. (Show your work!) A. Write the genotypes of...
A gray-body fly with long wings is subjected to a test cross. The F1 progeny of...
A gray-body fly with long wings is subjected to a test cross. The F1 progeny of this test cross: Will only be of two phenotypes if the test cross fly is homozygous for both traits. Will only be of two phenotypes if the gray-bodied/long-winged fly is homozygous for both traits. Will be of four genotypes if the gray-bodies/long-winged fly is heterozygous for both traits. Will be of four genotypes if the test-cross fly is heterozygous for both traits. None of...
6. In Cross 1, a yellow eyed, long wing fruit fly from a pure breeding strain...
6. In Cross 1, a yellow eyed, long wing fruit fly from a pure breeding strain is mated to a red eye, short wing fruit fly from a pure breeding strain. All of their offspring (F1) had red eyes and long wings. In Cross 2, one of the F1 offspring is mated to a fly with yellow eyes and short wings, and this cross gave the following F2 population: 194 flies with long wings and red eyes, 796 flies with...
One-Gene Crosses 1. In Drosophila, gray body color is dominant over black body color. By crossing...
One-Gene Crosses 1. In Drosophila, gray body color is dominant over black body color. By crossing a heterozygous gray-bodied fly with a black-bodied fly, one hundred offspring resulted. How many would be expected to have black bodies? 7 2. Albinism, the lack of pigment, occurs commonly in animals and is always recessive to normal pigmentation. Ten brown and eight albino mice were born to parents which were likewise brown and albino. What are the genotypes of both parents? 3. The...
Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white...
Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A-G). In each strain, the white eye trait is due to an autosomal recessive allele. It is possible all seven strains have mutations in the same gene. Alternatively, they may have mutations in different genes. To determine how many genes are involved in eye color in these flies, pair-wise crosses are performed between each strain. The offspring phenotypes resulting from...
A male mouse from a true-breeding strain of hyperactive animals is crossed with a female mouse...
A male mouse from a true-breeding strain of hyperactive animals
is crossed with a female mouse from a true-breeding strain of
lethargic animals. (These are both hypothetical strains.) All the
progeny are lethargic. In the F2 generation, all offspring are
lethargic.
What is the best genetic explanation for these observations?
recessive then a If the lethargic gene is the F2 progeny would be immediate progeny. may be involved. In that case, some of lethargic because maternal effects are temporary, affecting...
In the fruit fly Drosophila, a rudimentary wing called "vestigial" and dark body color called "ebony" are inherited at independent loci and are recessive to their dominant wild-type counterparts, full wing and gray body color. Dihybrid wild-type males and females are crossed, and 4800 progeny are produced. How many progeny flies are expected to have vestigial wings and gray bodies? How many progeny flies are expected to have full wings and gray bodies? How many progeny flies are expected to...
E10 from Brooker: In fruit flies, curved wings are recessive to straight wings, and ebony body is recessive to gray body. A cross was made berween true-breeding flies with curved wings and pray bodies and flies with straight wings and ebony bodies. The F1 offspring were then mated to flies with curved wings and ebony bodies to produce an F2 generation. A. Diagram the genotypes of this cross starting with the parental generation and ending with the Frencration B. What...
could someone help me figure out how to do these
pleaseeee
A female fruit fly who is heterozygous with the phenotype gray body, red eyes & long wings is crossed with a male who is homozygous recessive (black body, purple eyes, vestigial wings). The observed offspring are shown below: # offspring, body color. eye color. wing length 411 gray red long 61 gray red vestigial 2 gray purple long 30 gray purple vestigial 28 black red long black red vestigial...
3-3. In the fruit fly, Dichaete (D) is a dominant autosomal mutation that affects wing shape; it is lethal when homozygous. Ebony body, e, and rose eye, r, are recessive mutations also located on the same chromosome. Dichaete flies were crossed to pure-breeding ebony, rose flies. Among the F1 were Dichaete progeny with normal body and eye color. Female Dichaete F1 were test-crossed to ebony, rose males, with the results listed below. (Show your work!) A. Write the genotypes of...
A gray-body fly with long wings is subjected to a test cross. The F1 progeny of this test cross: Will only be of two phenotypes if the test cross fly is homozygous for both traits. Will only be of two phenotypes if the gray-bodied/long-winged fly is homozygous for both traits. Will be of four genotypes if the gray-bodies/long-winged fly is heterozygous for both traits. Will be of four genotypes if the test-cross fly is heterozygous for both traits. None of...
6. In Cross 1, a yellow eyed, long wing fruit fly from a pure breeding strain is mated to a red eye, short wing fruit fly from a pure breeding strain. All of their offspring (F1) had red eyes and long wings. In Cross 2, one of the F1 offspring is mated to a fly with yellow eyes and short wings, and this cross gave the following F2 population: 194 flies with long wings and red eyes, 796 flies with...
One-Gene Crosses 1. In Drosophila, gray body color is dominant over black body color. By crossing a heterozygous gray-bodied fly with a black-bodied fly, one hundred offspring resulted. How many would be expected to have black bodies? 7 2. Albinism, the lack of pigment, occurs commonly in animals and is always recessive to normal pigmentation. Ten brown and eight albino mice were born to parents which were likewise brown and albino. What are the genotypes of both parents? 3. The...
Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A-G). In each strain, the white eye trait is due to an autosomal recessive allele. It is possible all seven strains have mutations in the same gene. Alternatively, they may have mutations in different genes. To determine how many genes are involved in eye color in these flies, pair-wise crosses are performed between each strain. The offspring phenotypes resulting from...
A male mouse from a true-breeding strain of hyperactive animals
is crossed with a female mouse from a true-breeding strain of
lethargic animals. (These are both hypothetical strains.) All the
progeny are lethargic. In the F2 generation, all offspring are
lethargic.
What is the best genetic explanation for these observations?
recessive then a If the lethargic gene is the F2 progeny would be immediate progeny. may be involved. In that case, some of lethargic because maternal effects are temporary, affecting...
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