Log in
Biology
1
answer
0
watching
227
views

1A Which of the following statements is accurate about genetics? (select all that apply)

A

A recessive allele can't produce a phenotype
B

A dihybrid cross is one in which both genes must be heterozygous.
C

A test cross is to see if the parents can produce viable offspring
D

The f1 generation refers to the 1st generation resulting from a particular genetic cross

Watch
1
answer
0
watching
227
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Trinidad Tremblay
Trinidad TremblayLv2
28 Sep 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Molecular Cell Biology
8 Edition,
Lodish
ISBN: 9781464183393
Biology: Science for Life with Physiology
6 Edition,
Belk
ISBN: 9780134555430
Biology
2nd Edition, 2013
Openstax
ISBN: 9781947172517
Concepts of Biology
OER Edition,
Openstax
ISBN: 9781938168116
Essentials of Biology
5 Edition,
Mader
ISBN: 9781259660269

Related questions

Problem A. You cross two homozygous parents: RRYY (round yellow) and rryy (wrinkled green) to produce an F1 generation. Round seeds are dominant, yellow seeds are dominant. You cross two F1s to produce the F2 generation. In the F2 generation, you find an individual with round yellow seeds. You do a testcross to find out the genotype of this “mystery” dominant/dominant phenotype. In the offspring of the cross, you find 1?2 have round yellow seeds and 1?2 have wrinkled yellow seeds.
1. Based on these data what was the genotype of the mystery F2?

Problem B. You carry out a dihybrid cross between a red-flowered rose with long pollen grains (A1A1 LL) and a white-flowered rose with round pollen (A2A2 l l). The flower color gene (A) shows incomplete dominance, and long pollen is completely dominant to round pollen. The genes for these traits are on different chromosomes so assort independently
2. What would be the phenotypes of the F1 generation?
3. What fraction of the F2 generation is expected to have red flowers and long pollen? (As always when traits are independent, what rule can you apply to save time?)

Problem D. In the example of epistasis presented in class, the agouti allele in mice (A) codes for striped hairs and is dominant to the allele for all black hairs (a). A loss-of-function allele for the pigment gene (b) produces no pigment and is recessive to the normal, dominant allele (B). The recessive allele at b masks the effect of the A gene. A dihybrid cross of AABB and aabb is carried out.
5. Name all of the genotypes in the F2 generation that can produce an albino (no pigment) phenotype.

Problem E. A cross is made between homozygous fruit flies that differ for eye color (the st gene) and
body color (the e gene). The F1 double heterozygote is shown below using chromosome notation.
st+ e
--------------------------------------
st e+
st = the recessive allele for scarlet eyes; st+ = the dominant wildtype allele for red eyes e = the recessive allele for ebony body; e+ is the dominant wildtype allele for gray body

6. Are the chromosomes shown in the genotype above in cis or trans configuration?
7. Based on this notation, what were the genotypes and phenotypes of the two parents of the F1? (Think carefully here...)
8. With what phenotype would you cross this F1 to measure recombination frequency?

The drosophila alleles for black body (instead of the normal tancolor, which is the wild type) and curved wings (instead of thewild-type straight wings) are both recessive and on chromosome 2.Gene “C” designates color, with alleles C representing the dominanttan allele and c representing the recessive black allele, whilegene “W” designates the wing shape gene with W being the dominantstraight allele and w the recessive curved allele. You need todiscover how close together these two genes are on chromosome 2.You place one male from a pure breeding stock and one female from apure breeding stock (these are the ‘parental’ or ‘generation zero’(G0) flies) into vial 1. The offspring of this cross (cross 1)hatch in vial 1. These offspring (Generation 1, G1) areheterozygous for both genes. You perform the cross from the abovequestion and get 500 offspring in vial 2 (these are the G2 flies).Among these G2 flies, 65 have tan bodies and curved wings, 70 haveblack bodies and straight wings, 190 have black bodies and curvedwings, and 175 have tan bodies and straight wings. What are thegenotypes of offspring with parental phenotypes? What are thegenotypes of the recombinant offspring? wo true breedingparents (G0) gave rise to the doubly heterozygous (G1) flies invial 1. What were the genotypes of these parents? Whatis the percent of recombinants for these two genes? Ifthe two genes were actually on different chromosomes, whatphenotypic distribution would you expect in the G2 flies (insteadof 65 tan curved, 70 black straight, 190 black curved, and 175 tanstraight)? If the two genes were actually on differentchromosomes and you crossed the heterozygous flies to each other(did a self cross) what phenotypic distribution would you expectfrom the offspring?

1. A person is described as a carrier for a particular genetic disease. What does this tell you about their genotype?

2. For any given gene, the principle of independent segregation predicts that each gamete produced as a result of meiosis will contain ____________________

3. A pair of alleles is said to be heterozygous when:


4. In a diploid species, cells can have up to ___ alleles of a particular gene.

5. In a cross between a homozygous dominant parent and a homozygous recessive parent, the number of phenotypic classes observed in the offspring is ______

6. For a person of genotype Xx, the genotype of their gametes may be ______________

7. In a "test cross", an individual of unknown genotype is crossed with a ___ individual to determine the unknown genotype.

8. An albino woman has a child with a phenotypically normal man with no family history of albinism (which is a rare recessive disorder). What percentage of their children are likely to be albino?

9. An individual with the dominant phenotype, but an unknown genotype, is test-crossed, and all of the offspring exhibit the dominant phenotype. The genotype of the unknown individual is ______________

10. If two heterozygous individuals for a recessive disease (carriers) have a child, what is the chance that their child will develop the disease?

11. In a monohybrid cross between two true-breeding parents that both exhibit the dominant phenotype, ___ percent of the offspring will exhibit the recessive phenotype.

12. In a particular type of tomato plant, red fruit is dominant over yellow fruit, and dwarf height is a recessive trait. If two heterozygous plants were crossed, what proportion of the offspring would show the dominant phenotype?

13. In a cross between a BbRr individual and a BBRR one, what do the following represent: BR, Br, bR, br?

14. In humans, the gene that determines whether an embryo develops as a male or a female is carried on _____________

Weekly leaderboard

Home
Homework Help 3,900,000
Biology 460,000
Start filling in the gaps now
Log in