From a cross of heterozygotes, which of the following phenotypic ratios suggests a lethal allele in the homozygous dominant? (ratios given as dominant: recessive phenotypes) Group of answer choices 2:1 1:2:1 3:1 3:0

In the example below, crossing you left thumb over your right thumb is dominant T to crossing your right over left recessive t. Identify the genotype of the individual shown below: OShutterstock / robynleig O A. homozygous dominant (TT) O B. heterozygous dominant (Tt) or homozygous dominant (TT) OC. homozygous recessive (tt) O D. Cannot be determined from information provided

You are a zoologist working with Giraffes. Their main traits are: Grey tongues (G+), Rudimentary Horns (R+), Long necks (L+) . You perform the following testcross with an individual with recessive versions of all 3 of the traits. P: G+ R+ L+/G+ R+ L+   x G R L /G R L F1(all identical): G+ R+ L+/G R L What this the distance between G and R? What is the distance between G and L? What is the distance between R and L? What is the correct order of the genes on the chromosome? (5 points) (Hints: You should draw it first. The overall order will not change whether reading from the left or the right side of the chromosome).  a. G--R--L b. L--G--R c. G--L--R

Rabbit fur is determined by multiple alleles. Solid color is controlled by the Ic allele, the chinchilla by the Ich allele, the Himalayan by Ih and the albino by i. The dominance hierarchy of these alleles is Ic> Ich> Ih> i. Write the gametes that a HIMALAYAN rabbit would form [x1]

An allelic series determines coat color in rabbits: C (full color), cch (chinchilla, gray color), c* (Himalayan, white with black extremities), and c (albino, all white). The C allele is dominant over all others, cch is dominant over c and c, ch is dominant over c, and c is recessive to all other alleles. This dominance hierarchy can be summarized as C> cch > c^ > c. The rabbits in the table are crossed and produce the progeny shown. Cross Parents Offspring А full color x albino 50% full color, 50% albino В Himalayan x albino 50% Himalayan, 50% albino C full color x albino 50% full color, 50% chinchilla D full color × Himalayan 50% full color, 25% Himalayan, 25% albino E full color x full color 75% full color, 25% albino Match the parental genotypes to the letter corresponding to the appropriate cross listed in the table. A В C D E Answer Bank Ccch x cc Cc x cc СС х сс hch x cc Сс х сс Сс х Сс chc x cc

Assuming completely dominant genes, independently assorting,  among the crosses below which will give 100% offspring with the same phenotype? Group of answer choices AaBB x aaBB AaBb x aabb AABB x aabb AaBb x AaBb

What percent of offspring will be homozygous recessive if the genotypic ratio is 4:0:0.  (For your answer write the number and the percent sign, example:  32%)

Match the type of genetic dominance with the appropriate term: More than two type of alleles for a given trait Both alleles are expressed equally 1. Complete dominance 2. Incomplete dominance Phenotype of dominant homozygote and heterozygote are same 3. Codominance 4. Multiple Alleles Heterozygotes have intermediate (hybrid) between the two homozygotes

Consider the following three point trihybrid testcross ibvolving traits in dragons. The genotypes determining the 8 progeny types from this testxross are shown below out of a sample of 1572 flies. What number of progeny for each genotype would you predict in the case of independent assortment. gametes number K L M  621 klm    608  k L M  103 K lm    109  K lm    64 k L m    57 K L m    3 k l M   7

In frost moths, two alleles of one gene determine the character difference of spotted versus striped wings and two alleles of a separate, independent gene determine the character difference of orange wing background versus white wing background. The results for four matings of moth phenotypes are shown below.     Number of progeny Mating Parental Phenotypes Spotted/orange Spotted/white Striped /orange Striped  /white 1 spotted/orange x striped/orange 623 0 637 0 2 spotted/white x striped/orange 0 0 0 712 3 spotted/white x striped/orange 122 131 128 133 4 spotted/orange x striped/white 0 0 430 422 striped= S(dominant) spotted=s (recessive) white= W(dominant) orange=w (recessive)   What are the genotypes of each parent in each cross?  If more than one genotype is possible, list the alternative possibilities.  (Remember that each mating involves a separate set of parents, so the 4 matings involve 8 separate…