BIO 2133 Chapter 3: Module 4D_4E notes

53 views2 pages

graygiraffe944

9 Mar 2017

School

Department

Course

Professor

For unlimited access to Textbook Notes, a Class+ subscription is required.

Document Summary

Laws of probability in genetics 4d https://www. youtube. com/watch?v=npc-vmllrms. A woman with albinism and a carrier marry and have children. Polydactyly (extra digitis) is a very rare autosomal dominant trait. A man and woman with the disorder meet at a polydactyly support group and eventually have a child together. In this question it says that they are healthy, so therefore you disregard the ss chance of the offspring having this genotype. In a cross between parents of genotype aabbccddee and aabbccddee, what fraction of the offspring will be aabbccddee. A group of researchers studying turtles have isolated an autosomal mutation that confers ninja- like reflexes just prior to adulthood. This mutation is recessive to the normal slow allele. When homozygous slow turtle is mated to a homozygous mutant ninja turtle and the f1 are interbred, the following phenotypes are observed among the f2 young adults: 25 slow, 15 ninja.

Related Questions

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 _____________

amaranthhare726

1.) This summer, there was a surge in the number of albino children killed for their body parts in the African country of Malawi (yes, it's bizarre but sadly true: http://goo.gl/8o0imm and http://goo.gl/DK0r8M). Albinism in humans is inherited as a simple recessive trait. Assuming that two non-albino (normal) parents have five children, four of which are normal and one of which is albino, which of the following statements is true? Select all that apply (you must select all correct answers to get credit). Assume that 'A' indicates the non-albino allele and 'a' indicates the albino allele.

Multiple answers:You can select more than one option

A)The 4 normal children are heterozygous Aa

B)At least one of the normal siblings must be homozygous AA

C)The frequency of albino children is as expected for Mendelian inheritance

D)One of the parents cannot be Aa

E)One third of the normal children expected to be AA while the others Aa

2.)

Albinism in humans is inherited as a simple recessive trait. Assuming that a normal male and an albino female have 6 children, all normal, which of the following statements is true? Select all that apply (you must select all correct answers to get credit).

Multiple answers:You can select more than one option

A)The father could be heterzygous for the trait

B)The probability that all the children are heterozygous for the trait is (1/2)^5 = 1/32

C)The father cannot be Aa

D)The children should all be heterozygous for the trait

E)One would expect about 2/3 of the normal children to be Aa

F)The father must be AA

3.)

Given an albino male mating with a normal female to produce 3 normal children and 3 albino children, which of the following of Mendel's postulates are not being demonstrated by this particular scenario? Select all that apply (to get credit, all your choices must be correct).

Multiple answers:You can select more than one option

A)Postulate of segregation

B)Postulate of dominance

C)Postulate of independent assortment

D)Postulate of unit factors

4.)

Consider the cross: Ee ff Gg HH x Ee Ff gg HH (assume these are designations for genes that are inherited in a Mendelian fashion). What is the probability that a single offspring from this cross would be genotypically: ee Ff Gg HH or Ee ff gg HH?

A)1/16

B)1/32

C)9/64

D)1/6

E)3/16

F)27/64

G)1/64

H)3/64

I)1/8

J)3/8

___1. Nationally, the most common cause of Down Syndrome is
a. nondisjunction of Chromosome 21 during meiosis
b. translocation of Chromosome 21 onto another chromosome
c. inversion of a large section of Chromosome 21
d. deletion of the Down Syndrome gene
___2. In humans, sex is determined by
a. The presence or absence of the Y chromosome
b. The ratio of X chromosomes to sets of autosomes
c. The temperature during fetal development
d. Which parent is stronger at the time of conception
___3. A translocation is
a. a chromosomal abnormality in which a piece of one chromosome breaks off and attaches to a different chromosome
b. an abnormality in which the chromosomes are translocated out of the nucleus
c. a condition in which the chromosome has broken in two places and come back together with the middle segment backward
d. an abnormality in which there is an extra copy of one chromosome
___ 4. In snapdragons, a red-flowered plant crossed with a white-flowered plant produces all pink-flowered offspring. But crossing two pink-flowered plants produces red, pink, and white in a 1:2:1 ratio. This is a good example of
a. Incomplete dominance
b. Dominance of the red allele over the white allele
c. Lethal effects of the pink allele
d. Sex-linkage of the flower-color alleles
___ 5. If a person with type AB blood marries a person with Type O blood, what blood types are possible in their children? (Assume this trait is a single-gene trait, not complicated by interaction with other genes).
a. A, B, AB, or O
b. A or B only
c. AB or O only
d. AB only 2
___6. In what phase of meiosis are haploid nuclei first formed? a. Anaphase I b. Metaphase II c. Telophase II d. Metaphase I e. Telophase I
___7. What is the phenotype of a heterozygous tall pea plant? a. tall b. Tt c. TT d. tt e. dominant
___ 8. If genes A and B are far apart on a chromosome, and A and C are close together, which of the following observations is expected?
a. Crossing over will occur more often between A and C than between A and B
b. Crossing over will occur at equal frequencies between A and C, and between A and B
c. Crossing over will occur more often between A and B than between A and C
___9. Sometimes an organismâs genotype for one gene masks the effect of a different gene. This phenomenon is called
a. Dominance
b. Incomplete dominance
c. Co-dominance
d. Epistasis
e. Variable expressivity
___10. The dominant allele of a gene is
a. The one that is expressed most often in a population
b. The one that is expressed most often in any particular cross
c. The one that is expressed in an individual that has two different alleles
d. The one that is most healthy to have, that gives the greatest fitness
___11. In human cells, DNA replication occurs
a. In S phase of interphase
b. In G1 phase of interphase
c. In G2 phase of interphase
d. In prophase of mitosis
e. Whenever the cell needs to read the DNA to make proteins
___ 12. A process in which recipient cells take up genes from DNA molecules floating free in the surrounding medium is called
a. conjugation
b. specialized transduction
c. generalized transduction
d. transformation 3
___ 13. Most calico cats are female. However, a few rare males are observed. What is the genotype of a male calico cat?
a. X BX 0
b. X OY
c. X BY
d. X BYY
e. X BX OY
___ 14. A type of red-green color-blindness is a sex-linked (X-linked) recessive trait in humans. Can a woman have this type of color-blindness?
a. Yes, a woman could be color-blind if her mother and father were both heterozygous.
b. Yes, a woman could be color-blind but only if she has an abnormal number of sex chromosomes.
c. No, women can't show sex-linked traits because they lack a Y chromosome.
d. No, women can't show sex-linked traits because they have two X chromosomes.
e. Yes, a woman could be color-blind if her father was color-blind and her mother was a carrier (heterozygous).

BIO 2133 Chapter 3: Module 4D_4E notes

Document Summary

Get access

Related textbook solutions

Molecular Cell Biology

Biology: Science for Life with Physiology

Biology

Concepts of Biology

Essentials of Biology

Related Documents

BIO 2133 Chapter 4: Module 4F

BIOL 1090 Lecture Notes - Lecture 7: Barr Body, Color Blindness, Wild Type

MBG 2040 Study Guide - Midterm Guide: Ehlers–Danlos Syndromes, Barr Body, Research In Computational Molecular Biology

Related Questions