BIOL 222 Study Guide - Quiz Guide: X-Inactivation, Punnett Square, Dihybrid Cross

101 views3 pages

periwinkleweasel840

7 Sep 2016

School

Department

Course

Professor

For unlimited access to Study Guides, a Grade+ subscription is required.

Document Summary

Biol 222 - review points - week 2. Progeny from parental cross (dominant phenotype is observed) Progeny from f1 self-cross (dominant and recessive phenotypes observed) Test cross - crossing an unknown genotype to a homozygous recessive individual. If unknown is aa: only dominant phenotype observed. If unknown is aa: half of offspring will show the dominant phenotype, and half will show the recessive phenotype. A a aa a aa a aa aa. Mendel"s first law - equal segregation of alleles of a gene pair into gametes. Alleles of a gene pair assort equally into gametes in meiosis. Dihybrid cross (2 gene pairs: 9:3:3:1 f2 phenotypic ratio. Mendels 2 nd law independent assortment of gene pairs into gametes. Punnett square vs. branch diagram vs. multiplication rule: branch diagrams (for phenotypic ratios) Bb = 1/16 aabb: multiplication rule (use for anything above a dihybrid cross) Aa bb cc dd ee x aa bb cc dd ee.

Related Questions

Diagram a cross between a true breeding pea plant that produces yellow seeds (G/G) with one that produces green seeds (g/g). Carry the cross out to the F2 generation. Answer the following questions:

What was the F1 genotype and phenotype?

What kinds of gametes could the F1 individuals produce?

What were the F2 genotypes and phenotypes, and in what ratios would you expect each to occur?

Diagram a cross between a true breeding pea plant that produces round seeds and purple flowers, with one that produces wrinkled seeds and white flowers. (Round and purple are the dominant traits.) Carry the cross out to the F2 generation. Answer the following questions:

What are the P1 genotypes?

What is the F1 genotype and phenotype?

What kinds of gametes will the F1 individuals produce?

What are the F2 genotypes and phenotypes?

What genotypic and phenotypic ratios are expected in the F2 progeny?

Diagram a cross between a true breeding pea plant that produces yellow seeds (G/G) and purple flowers (W/W) with one that produces green seeds (g/g) and white flowers (w/w). Carry the cross out to the F2 generation. Answer the following questions:

What was the F1 genotype and phenotype?

What kinds of gametes could the F1 individuals produce?

What were the F2 genotypes and phenotypes, and in what ratios would you expect each to occur?

Diagram a test cross of the F1 individuals from the question above, with the homozygous recessive parent strain. What genotypes and phenotypes would you expect in the testcross progeny, and in what ratios?

If you had a fruitfly with phenotype A, what test would you make to determine if it was Aa or AA? Explain the different outcomes expected if the fly in question is AA or Aa.

If individuals of genotype AaBbCc are intercrossed:

How many different genotypes can occur in their progeny? How many different phenotypes can occur in the progeny?

orangecrow253

1. Ifa species of flower has the allele R (red) which is incompletelydominant to the allele r (white) what color is the genotype of anindividual with a red flower? Choose as many as areappropriate. (Points: 2) RR
Rr
rr
R
r

2. A gene can be defined as... (Points :2)

alternateforms of the DNA for a trait
geneticcombination that determines the observable form of a trait
partof the DNA that codes for a specific protein
theobservable form of a trait

3. A homozygote is an individual in which(Points : 2)

allelesof the gene pair are different
allelesof the gene pair are identical
genesare homolgous
traitsare passed from parents to progeny

4. Which of the following might be aphenotype? (Points : 2)

A
Aa
pinkflowers
AaDd

5. What does "F2 generation" refer to? (Points: 2)

theparents
theoffspring of the parental generation
theoffspring of crossing the F1 generation with itself
theoffspring of crossing the F1 generation with the parentalgeneration

6. Which of the following genotypes isheterozygous? (Points : 2)

Aa
AABB
A
a

7. Which statement best describes a dominantallele? (Points : 2)

theallele expressed in the homozygote
theallele expressed in the heterozygote
theallele that is most common in the population
theallele that is lethal

8. In a monohybrid cross, if genotype AA iscrossed with genotype aa what will the ratio of genotypes be?(Points : 2)

0AA:1 Aa:0 aa
1AA:2 Aa:1 aa
1AA: 1 aa
1AA:1 Aa:1 aa

9. Leaf color is controlled by 2 alleles whereA (green) is dominant to a (yellow). Leaf shape is controlled by 2alleles where B (round) is dominant to b (heart-shaped). If oneparent's genotype is AABB what is its phenotype? (Points : 2)

green,round leaves
green,heart-shaped leaves
yellow,round leaves
yellow,heart-shaped leaves

10. Leaf color is controlled by 2 alleleswhere A (green) is dominant to a (yellow). Leaf shape is controlledby 2 alleles where B (round) is dominant to b (heart-shaped). Ifthe genotype AaBb is crossed with the genotype AaBb what will theratio of phenotypes be? (Points : 3)

1green, round: 1 green, heart: 1 yellow, round: 1 yellow,heart
1green, round: 2 green , heart: 2 yellow, round: 1 yellow,heart
9green, round: 3 green, heart: 3 yellow, round: 1 yellow,heart
9AABB: 3 Aabb: 3 aaBb: 1 aabb

yellowbutterfly55

Complete the four-part question.

If you have an organism in which the A allele is dominant to the a allele, a heterozygote will produce gametes of either A or a. This is what leads to two phenotypes among the offspring in an F2 cross (ie. Aa x Aa). In genetic terms this is called

a. dominant

b. recessive

c. segregation

d. independent assortment

e. none of the above

If you have an organism of genotype AaBb (A dominant to a, and B dominant to b), there will be 4 phenotypic classes among F2 progeny in a 9:3:3:1 ratio. In genetic terms this is an example of

a. dominant

b. recessive

c. segregation

d. independent assortment

e. none of the above

Which type of nuclear division produces diploid cells from diploid cells? Haploid cells from diploid cells?

a. fission, fusion

b. meiosis, mitosis

c. mitosis, meiosis

d. linkage, independent assortment

e. none of the above

If a pea plant shows a recessive phenotype

a. it can be either TT or Tt

b. it can be either Tt or tt

c. it can be only TT

d. it can only be tt

e. it can be TT, Tt ot tt

brownwildebeest141

BIOL 222 Study Guide - Quiz Guide: X-Inactivation, Punnett Square, Dihybrid Cross

Document Summary

Get access

Related Documents

BIOL 222 Lecture Notes - Lecture 3: Gregor Mendel, Phenotype, Zygosity

BIOL 222 Lecture Notes - Lecture 6: Epistasis, Summer Squash, Pigment

Related Questions