BIOL 1201 Lecture : Bio 1201 Lecture Notes

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azuremammoth471

15 Mar 2019

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Mendel"s first law: the two members of a gene pair separate from each other into the gametes, each gamete carries one of the alleles, mendelian segregation occurs in anaphase i of meiosis. Individual with the a dominant trait may be homozygous or heterozygous. Individuals displaying a recessive trait must be homozygous for the recessive allele. Test cross: how do you determine of the individual is homozygous or heterozygous, phenotype is p, genotype is p, could be pp pp, cross the individual with an unknown genotype with a homozygous recessive individual; If the individual with the unknown genotype is homozygous dominant then the offspring will display the dominant trait. If the individual with the unknown genotype is heterozygous then half would have the dominant trait and the other half will have the recessive trait: phenotype is relative to a dominant or recessive trait. If the unknown is homozygous then the phenotypes will be all dominant.

Related Questions

When a parent who is heterozgyous for a trait is crossed with a parent who is heterozygous for a trait, the offspring will:

(remember homozygous means two of the same alleles and heterozygous means two different alleles)

Select one:

a. have 3 out of 4 the dominant phenotype and 1 out of 4 the recessive phenotype

b. have 2 out of 4 the dominant phenotype and 2 out of 4 the recessive phenotype

c. all have the dominant phenotype

d. have 1 out of 4 the dominant phenotype

When a parent who is heterozgyous for a trait is crossed with a parent who is homozygous dominant for a trait, the offspring will:

(remember homozygous means two of the same alleles and heterozygous means two different alleles)

Select one:

a. all have the recessive phenotype

b. all will have the dominant allele

c. all be homozygous dominant genotype

When a parent who is heterozgyous for a trait is crossed with a parent who is heterozygous for a trait, the offspring will:

(remember homozygous means two of the same alleles and heterozygous means two different alleles)

Select one:

a. have 3 dominant phenotypes, 2 heterozygous genotypes, and 1 homozygous recessive genotype

b. have 1 dominant phenotype, 2 heterozygous genotypes, and 1 homozygous recessive phenotype

c. have all dominant phenotypes, 2 heterozygous genotypes, and 1 homozygous recessive genotype

When doing Punnett squares for fur, the letter f represents ______ and the letter F represents _____.

Select one:

a. the recessive allele, the dominant allele

b. the dominant allele, the recessive allele

c. the dominant gene, the recessive gene

d. the recessive gene, the dominant gene

10.

When a parent who is heterozgyous for a trait is crossed with a parent who is homozygous recessive for a trait, the offspring will:

(remember homozygous means two of the same alleles and heterozygous means two different alleles)

Select one:

a. be half heterozygous and half homozygous recessive

b. be all heterozygous

c. be all homozygous recessive

d. be all homozygous dominant

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. The Manx cat has a very short or no tail due to a dominant trait T. Cats who inherit one dominant (T) and one recessive (t) allele will be tailless (Manx); cats who are homozygous recessive will have normal, long tails. However, the homozygous dominant condition (TT) is lethalâthe embryo will not develop. If two Manx cats breed, what are the chances of Manx offspring or kittens with long tails?

A. There will be no offspring at all, since none of the embryos will develop.

B. All offspring will be Manx cats.

C. All offspring will be kittens with long tails.

D.Twice as many Manx as kittens with tails.

E. Equal chance of Manx or kittens with tails.

2. Given what we know about Mendelian genetics, what is the genotype of pea plants with white flowers?White is a recessive trait while purple is a dominant trait.

A. hemizygous recessive

B. pw

C. w

D. homozygous recessive

E. heterozygous

BIOL 1201 Lecture : Bio 1201 Lecture Notes

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