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Which of the following were important elements of Mendel's experimental design?

A. Controlled matings and reciprocal crosses
B. Choice of traits that had clear-cut alternate forms (antagonistic forms)
C. Choice of experimental organism
D.The use of pure breeding lines
E. Controlled environment
F. All of the above

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Beverley Smith
Beverley SmithLv2
28 Sep 2019
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Related questions

1. (10 points) You are studying wing colour in a newly discovered type of butterfly. The ZW system is used in butterflies, where males are Z/Z and females are Z/W. You have two different populations of pure-breeding butterflies. One population has orange and black wings and the other has solid orange wings.

b) What does pure-breeding mean? (1 point)

You do a pair of reciprocal crosses with your two populations. CROSS A involves black and orange females crossed to solid orange males. All the F1 offspring of cross A have solid orange wings.

c) What have you learned from this cross? (1 point)

CROSS B involves a solid orange winged female and a black and orange male.

d) Predict the outcome expected if the wing colour trait is sex-linked. Use defined symbols of your choice in your explanation. (2 points)

e) Predict the outcome expected if the wing colour trait is autosomal. Use defined symbols of your own choice (2 points)

f) If the trait is sex-linked, predict the offspring expected if the F1 from cross B (described in part d, above) are interbred. (2 points)

(10 points) You are studying wing colour in a newly discovered type of butterfly. The ZW system is used in butterflies, where males are Z/Z and females are Z/W. You have two different populations of pure-breeding butterflies. One population has orange and black wings and the other has solid orange wings.

b) What does pure-breeding mean? (1 point)

You do a pair of reciprocal crosses with your two populations. CROSS A involves black and orange females crossed to solid orange males. All the F1 offspring of cross A have solid orange wings.

c) What have you learned from this cross? (1 point)

CROSS B involves a solid orange winged female and a black and orange male.

d) Predict the outcome expected if the wing colour trait is sex-linked. Use defined symbols of your choice in your explanation. (2 points)

e) Predict the outcome expected if the wing colour trait is autosomal. Use defined symbols of your own choice (2 points)

f) If the trait is sex-linked, predict the offspring expected if the F1 from cross B (described in part d, above) are interbred. (2 points)

please provide good explanations

Canaries: Green (wild-type) Pied phenotype Yellow type

Canaries are popular pets and easy to breed in captivity. Additionally, they display great phenotypic diversity, which allows you to do some interesting genetic investigations with them.

When you take a canary from a true-breeding green strain and cross it with a canary from a true-breeding yellow strain, all offspring display the pied phenotype. Based on this you suspect that this color variation is inherited by a gene with a co-dominant inheritance pattern (showing both phenotypic traits in hybrid phenotypes).

You decide to test this hypothesis. To do so, you take pairs of your hybrid F1 individuals (of pied phenotype), and cross them to produce an F2 generation.

After many dozens of crosses and hundreds of offspring, you arrive at the peculiar ratio of:

3/16 green : 6/16 pied : 7/16 yellow

Which of the following hypotheses are consistent with these data? (Note that not all of these hypotheses are mutually exclusive. Assume that the two genes are independently assorting)

Hint: This problem is very hard to work from the given ratios to what is happening genetically. It is easier to "work backwards" and start with each choice below, and see if you can obtain all or important aspects of the results of your cross when making the assumption that the answer choice is correct.

Select all that apply:

Select one or more:

a. At least one of the genes involved is sex linked.

b. One gene controls production of darker pigment (melanin which appears green when mixed with yellow). A second gene acts as a patterning gene with one allele causing expression and the other non-expression of melanin and when in the heterozygous condition each allele controls melanin expression on different parts of the body so long as the bird's genotype of the first gene allows for the production of melanin.

c. this is a single-gene trait with co-dominance

d. one of the two genes involved displays complete dominance, while the other displays co-dominance.

e. the genes involved are epistatically interacting

f. more than one gene is involved

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