2) it is specified that the parents are homozygous
ts | ts | ts | ts | |
TS | TtsS | TtSs | TtSs | TtSs |
Ts | Ttss | Ttss | Ttss | Ttss |
TS | TtSs | TtSs | TtSs | TtSs |
ts | tsts | tsts | tsts | tsts |
3)The recessive lethal allele must be homozygous for it to be lethal
if s is the lethal allele
Ss vs Ss
S | s | |
S | SS | Ss |
s | Ss | ss |
one in 4 is dead
so the ratio is 3:1, 3 viable one dead.
4) and) duplication of a segment of chromosome 21
The down disease is a genetic condition associated with abnormal cell division tend to result in a child born with an extra copy or portion of chromosome 21. This mutation causes the developmental patterns and physical traits of down ’s syndrome.
Hence it is also called trisomy 21.
5) we need more information because
the order could be
ABC or CAB so we need more information to find out the actual distance
6) The reciprocal cross is used to determine the role of gender in phenotypes
for example crossing a male donkey and female horse produces a hinny, and male horse and female donkey produces a mule
so mendel performed it to determine whether the inheritance of a trail is determined by the parent who carries it.
Question 2 0.5 points Save As Suppose that in plants, smooth seeds (5) is dominant to...
Question 31 (1 point) In pea plants, round (R) seeds are dominant to wrinkled (r) seeds. In a genetic cross of two pea plants where one plant is heterozygous for the seed shape trait and the other is homozygous for the recessive (r) trait, what percentage of the offspring would have the wrinkled seed shape? O a) 25% Ob) 100% O c) 50% O d) 75% Question 32 (1 point) In pea plants, green (G) seeds are dominant to yellow...
In the tomato, three genes are linked on the same chromosome. Tall is dominant to dwarf, fruit skin that is smooth is dominant to skin that is peachy, and fruit with a normal tomato shape is dominant to oblate shape. A plant that is true-breeding for dominant traits was crossed to a dwarf plant with peachy, oblate fruit. The F1 plants were then test crossed to dwarf plants with peachy, oblate fruit. The following results are obtained. 200 tall, smooth,...
(More Genetics Problems and Difficult Genetics Problems). MORE GENETICS PROBLEMS 1. When tall plants mate with dwarf plants, only tall plants occur in the offspring. Assign symbols and show the phenotypes and genotypes in the parental (P) and first filial generations for a cross between tall plants and dwarf plants that produces only tall plants. 2. Show the expected outcome when the F1 plants in problem #1 are crossed. Be sure to give both phenotype and genotype ratios for these...
Table 1: Mendel's Traits and Symbols for Pea Plants Traits Symbol Symbol Dominant Allele Round Yellow Smooth Green Tall Axial Seed Shape Seed Color Pod Shape Pod Color Plant Height Flower Position S Recessive Allele Wrinkled Green Constricted Yellow Short Terminal а Refer back to Table 1 on the first pa abie 1 on the first page of this assignment to answer the following two questions. Use the appropriate symbols and phenotypes in your answer, 1. Show the genotypes of...
Name: PRELAB QUESTIONS 1. Define the following terms: Gene- Allele - Phenotype- Genotype- Homozygous dominant - Homozygous recessive- Heterozygous- 2. Put into your own words Mendel's law of segregation. LI Does the law of segregation always apply when dealing with genes located on chromosomes within a diploid nucleus? If not, explain why. 3. Mendel worked with several pea plant characters, each of which was determined by a single gene with two alleles, one dominant and the other recessive. For each...
_Date trait as 1 ol for the Name Genetics Practice Problems #2 - Writing Alleles Period Directions: Using the data in Table 1. write the enotype that correspond phenotype descriptions "e the genotype that corresponds to the em heig Symbol Round Table 1: Mendel's Traits and Symbols for Pea Plants Traits Dominant Allele Seed Shape I Symbol Recessive Allele Seed Color R Wrinkled Green Seed Coat Color White Pod Shape Constricted Pod Color Green Yellow Stem Height Tall Short Flower...
the Internet can contain vinuses. Unless you need to edit it's safer to stay in Protected view. IL LES 1) A man has six fingers on each hand and six toes on each foot. His wife and their daughter have the normal number of digits.(Remember that extra digits is a dominant trait.) What fraction of this couple's children would be expected to have extra digits? 2) In cocker spaniels, black color (B) is dominant over red (b), and solid color...
Let's say you have a pea plant that has the dominant traits for Tall stalks and Yellow seeds (TY). You want to know if this plant is homozygous for these traits, or heterozygous. What would you cross it with, and what is this called? A Monohybrid cross: TY X TY a plant with the same phenotype B. Dihybrid cross: a plant with a different trait (pink flowers and tall stalks) C. Test-cross; a plant homozygous for the recessive alleles: short...
Question 19 (1 point) In humans, a cleft chin is dominant (C) to a smooth chin (c). In a genetic cross between a heterozygous individual and an individual homozygous for the recessive trait, what percentage of offspring will have a smooth chin? O a) 75% Ob) 25% O c) 100% d) 50% Question 20 (1 point) In humans, a widow's peak hairline is dominant (W) to a straight (w) hairline. If the ratio of offspring inheritence is 3:1 for a...
A purebred sweet corn plant that produces purple and smooth kernels pollinates a purebred plant that produces yellow and wrinkled kernels. When the F1 was testcrossed, four types of kernels on the cobs were observed in almost equal proportions: purple and smooth, purple and wrinkled, yellow and smooth, and yellow and wrinkled. Which of the following statement(s) are TRUE? I. The F1 plants can only produce purple and wrinkled kernels when selfcrossed. II. If the parent that produces yellow and...